Sisters' Sexual Circumstances

Sisters' Sexual Circumstances is the twenty-first UMEMARO 3D release and 17th Mini-Movie Collection, released on May 25, 2019.

Cast

 * Mari Osano [first appearance]
 * Yuika [first appearance]
 * Kôji Osano [first appearance]
 * Unnamed brother-in-law of Mari and Yuika [first appearance]

Summary
"You peered into your brother's room to find his wife with his dick in her mouth.

He was tired with work and was happily snoring away, unaware of her actions.

She was trying hard to wake him, but he was sound asleep.

By the time you realize, it you had entered the room and was fondling her juicy ass...

You hear a stifled moan from a room late at night.

As you peer into the room, you see her younger sister.

She is trying her best to keep her voice down as she plays with her pussy.

She notices you and forces you into her room, as she continues to masturbate...

You've entered an immoral relationship with your sisters in law."

Synopsis
The audio track for the main menu sets the scene for the game. The audio is of Mari and Yuika discussing Mari's husband, Kôji, with the husband's younger brother present; Yuika derides Kôji's lack of attentiveness to Mari, while Mari justifies it by noting that he works hard for the family. They then discuss the younger brother's club activities, and advise him to not work so hard, so as not to be like Kôji.

The game opens with the player character, the younger brother, ascending the stairs and entering the apartment he shares with his older brother Kôji, Kôji’s wife Mari, and Mari’s sister Yuika, where he is greeted by the two sisters. At this point, the player can choose to investigate either Mari’s room or Yuika’s room.

Chapter Mari
If the player chooses Mari, they will crack open the door to see Mari attempting to have sex with Kôji, pleasuring him orally until he falls asleep, leaving her disappointed and distressed. At this point, having masturbated while watching them, the younger brother enters the room, sneaks up behind Mari, and begins orally pleasuring her. Once he is finished, he proceeds to have sex with her while she is still on the bed, then pulling her down to have sex with her on the floor. At this point, the player has two options: climax inside Mari, or climax outside of her. If the player chooses the former, the game ends, with an end card, six months into the future, showing Mari waving goodbye to Kôji as he leaves for work, visibly pregnant, the implication being that the child is the younger brother’s. Mari mentions that her husband is happy, but Mari can never tell him the truth.

Chapter Yuika
If the player chooses Yuika, they will crack open the door to see Yuika masturbating, mentioning the younger brother as she does so. The younger brother masturbates while watching her, but when he goes to close the door, he makes a noise, and Yuika sees him. She then drags him into her room and demands an explanation. Eventually, she invites the younger brother to continue watching her, the two of them masturbating together. The player, at this point, can attempt intercourse with Yuika, but she will block him until the player times it properly. She and the younger brother then have sex, and the player is given the same two options as the route with Mari: climax inside Yuika, or climax outside of her. If the player chooses the former, the game ends, with an end card, six months into the future, showing the younger brother and Yuika in her room together, Yuika now married to the younger brother and visibly pregnant with the younger brother’s child.

Chapter NEXT
Completing both routes without getting the bad endings unlocks the next segment, in which the younger brother, Mari, and Yuika are having breakfast the next day. The younger brother realizes that he has developed an erection unintentionally; Mari and Yuika reveal that they have spiked his drink with an aphrodisiac that Mari bought for use with her husband. They also reveal that they know the younger brother has had sex with both of them, and accost him, exposing his penis, with Mari beginning to give the younger brother a blowjob as Yuika focuses on his testicles instead. During this sequence, the player can switch to having Yuika giving the blowjob instead, while Mari sucks on his testicles; the player can also choose a neutral third option, and the player can climax at any time during this scene.

Following the climax, the younger brother collapses against the breakfast table, and Mari and Yuika accost the younger brother again, exposing their breasts. The player can choose which sister will give him a titjob, and the one that is not selected will pleasure him in other ways. After the younger brother climaxes again, the younger brother passes out; when they awaken, the player is again prompted to choose one of the sisters to have sex with, both girls commenting that the younger brother is still able to have sex. In both routes, the sister not chosen will masturbate and occasionally interrupt the intercourse to pleasure the younger brother orally, which results in the younger brother climaxing outside of the sister he chose when the other sister pushes them off. Following the climax, the younger brother passes out again.

When the younger brother wakes up, he sees that Mari and Yuika are engaged with each other, Mari fingering and pleasuring Yuika on the couch. The younger brother begins to have sex with Yuika; the player can switch to Mari during this sequence if they choose. At the end of the scene, the younger brother climaxes inside the sister he last chose to have sex with. This results in one of two “true” endings:

If Mari is chosen, the end scene shows Mari, visibly pregnant with the younger brother’s child, engaging in sounding with the younger brother. Yuika walks into the room after returning home early from school, annoyed to find Mari and the younger brother fooling around in the living room. Yuika complains that Mari will not allow her to have sex with the younger brother, threatening to tell Mari's husband who the father of her baby really is. Mari then invites her over to witness the younger brother’s orgasm, which occurs off-camera and ends the game.

If Yuika is chosen, the end scene shows Yuika, visibly pregnant with the younger brother’s child, giving the younger brother - whom she is now engaged to - a footjob while she reads a magazine. A voiceover during this segment reveals that she and the younger brother will marry once Yuika graduates. Mari opens the door and stands in the doorway, commenting on how the pair will afford living expenses. She then walks over and mounts the younger brother, having sex with him while Yuika protests, ending the game.

Background
After the release of Sexy Trainer Shoko Sugimoto in January 2018, UMEMARO took several months to begin conceptualizing his next work. The first indication that work had begun in earnest was in UMEMARO's April 18, 2018 update, in which UMEMARO revealed a preliminary design for the next protagonist. This character was strikingly similar in appearance to Kayo Shinozaki, which UMEMARO mentioned was because he used Kayo's hair as a placeholder. He also indicated that he had updated to Lightwave 2018 and FiberFX 2018, the older versions of which were significant bottlenecks for previous releases.

The next updates did not come for another two months, when UMEMARO debuted a completely redesigned protagonist, now in the appearance of a young, mid-20s woman, mentioning that he was sick once again, which was slowing down his work. A more substantial update arrived on June 13, in which UMEMARO provided a litany of scenarios, indicating that he could not decide which one to press forward with. He also explained the technical limitations he was under in terms of rendering characters and scenarios, which was one of the biggest problems in previous recent releases that he had to overcome.

In a blog post announcing the creation of a corporate website on July 5, UMEMARO mentioned that work on his current progress was temporarily on hold while he worked on an iOS application, for which no details were provided.

Throughout August and September, while the main blog was silent, UMEMARO posted several technical blog posts to his non-erotic blog, primarily complaining about the limitations and issues with Radiosity and his current rendering rig. These posts came with several renders and screenshots that seemed to imply that work on the mini-movie collection had actually continued after UMEMARO mentioned putting it on hold; the reveal of the protagonists on UMEMARO's main blog in September later confirmed this.

On September 25, having finished the characters and background objects, UMEMARO formally introduced the female protagonists, sisters Yuika and Mari Osano; Mari, identified as the older of the two, was previously revealed in June, sporting a somewhat different design, and both of them had featured in updates on UMEMARO's non-erotic blog in August and September. This update, and the character details, also seemingly confirmed that UMEMARO had decided on the final scenario listed in the June 13 update. The post three days later mentioned brief retouching on Mari, including the return of her choker.

On September 29, UMEMARO revealed that his primary work computer had blue-screened; he later clarified, in a comment on the post, that it appeared to be an issue with his graphics card not being properly set in the computer, though he also noted that he would likely have to replace it anyway, due to the strain his work had been putting on it.

The next update did not come until November 22, in which UMEMARO reiterated that work was progressing, but stated that a 2018 release was not feasible, anticipating a February or March 2019 release instead. Work on the collection continued through early 2019, with subsequent updates being sparse on information, though UMEMARO appeared to struggle mightily with the last scene he was working on, commenting in February and March that the scene was giving him issues. Finally, on May 15, UMEMARO announced the completion of the collection, with a release to follow by the end of the month.

Gameplay is more dynamic than in previous releases; while there remains the option to choose the character to interact with at several points during the game, the player also has more control over the scenario, needing to use these controls to puzzle their way through to the next scenario. This is similar to the previous function of watching certain angles multiple times to unlock new ones, but provides more interactivity by putting the control more in the hands of the player than before.

Sisters' Sexual Circumstances is the first release since Pizza Takeout Obscenity to feature bad endings; these come at the end of the first scene, depending on the player's choices.

Re-releases
Sisters' Sexual Circumstances has received two physical releases:


 * A DVD release via I STUDIO on August 2, 2019.
 * A DVD release via WORLD PG on October 25, 2019.

Trivia

 * The school bag Yuika carries in Mari's true ending is the same one that a young Shoko Sugimoto carries in The Chiropractor, and that Kiyoran Tsukahara carries in Horny Girl.
 * Sisters' Sexual Circumstances is the first UMEMARO 3D release in which:
 * impregnantion is shown, with all four endings of the game showing one of the two sisters visibly pregnant as a direct result of the game's events.
 * a full netorare scene occurs, in the first scene where the younger brother has sex with Mari while her husband is asleep next to them; Mai previously had light netorare elements, though they did not fit the traditional parameters of the trope.
 * there is more than one "true" ending, that stand alone and are not reconciled with a singular closing scene.
 * This is the second release to show true incest, the first being Pizza Takeout Obscenity.
 * The gap between Sexy Trainer Shoko Sugimoto and Sisters' Sexual Circumstances is the longest between two UMEMARO 3D releases since the gap between OMEGA 2 and Work in Progress.