Ch.5: After crashing into each other, teacher Kasuga becomes interested in the astronomy club's beautiful, lone member Amamiya. Kasuga volunteers to be the club's advisor to get closer to Amamiya in seclusion.
Ch.2: Siscon Jun is suspicious when his model sister's senpai Haruto wants to get close to him
Ch.3: After 3 years, Megu has shown up to Tokyo, to make Shou fulfill his promise of taking Megu's virginity, when he turns 18
Ch.1-2.4.5: One day, S call boy Hiro accepts a strange client, K-san. Growing up, K-san's religious mother banned anything sexual, so K-san wants Hiro to make him use to sex. However, K-san turns out to be Kuki, Hiro's boss at his intern job
Mizuki's domineering mother is in control of his entire life, including prohibiting anything sexual. When Mizuki is frequently molested by the same person on the train, he welcomes the perpetrator's acts. Eventually, Mizuki catches his molester, Shinobu, and secretly records his confess. In exchange for not reporting him, Mizuki wants Shinbu to violate him more. Shinobu accepts, following Mizuki's command. The sexually repressed Mizuki and emotionless Shinobu gradually change each others' lives
When Yul is having trouble with his AI project DD, a conversation robot, his friend introduces him to retired professor Manaka. Manaka offers to take care of DD for a while, as its conversation partner, to help the AI learn words and conversation more clearly. Though Yul is embarrassed to share DD, as DD was modeled using his own personality and voice, he entrusts it to Manaka. While listening to the recordings of Manaka's gentle and loving conversations with DD, Yul ends up falling for Manaka.
After Yukito's mother left, Yukito's stepfather and famous author Tsukishima suffered a mental break, becoming unable to writing, possessive, and forcing a sexually relationship on him. To keep Tsukishima's career as an author from dying, Yukito secretly sells his body. After an award party, the two enter Gotou's taxi and their relationship is revealed by one of Tsukishima's outbursts. When Yukito tries his usual tactics to silence Gotou, he instead finds a safe place
Ch.10-11: After being mistaken for his rich friend, Kano was attacked and fell in love at first sight with one of his attackers, Kanzaki. After recovering, Kano tracks Kanzaki down and tries to return the money Kanzaki sent as an apology. However, Kanzaki refuses to take it back. As a compromise, the two go on a date to spend the all of money
Though he looks like a delinquent, Riku is actually a romanticist and family-oriented high schooler. One night, on his way to pick up his younger brother Aoi, Riku is suddenly hugged by a drunk man, who offers Riku $300 for a night and Riku immediately runs away. They meet again, when Riku takes Aoi to his friend's home and discovers the man, Takashi, is his guardian. However, this time Takashi asks Riku out properly.
College student Tatsuki is the cocky son of a C.E.O, who often looks down on others. When Tatsuki gets tired of playing around with girls, he decides to try guys on his friend's joke suggestion. Tatsuki targets Miyako, a timid student rumored to be selling himself for tuition money. However, after forcing a blowjob from Miyako, Miyako's true sadistic personality comes out. Now, Tatsuki had become Miyako's toy.
Theodor is obsessed with his older brother Nick and makes it clear to Louis, his college professor and brother's lover, he disagrees with their relationship. Little did he know, Nick had already dumped Louis, prior to their encounter. Annoyed by Theodor's insults and questions, Louis lies that he was the one to end the relationship. However, Louis's lie only makes Theodor interested in getting to know him, the only person to ever reject his brother, and begins stalking Louis.
Oujisama no Seitai