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One day, Chika discovers his friends Ryo and Nao, also Chika's crush, are sex friends and Nao invites him to join in. A year after their activities started, Nao suddenly says Chika should try bottoming, but, since Nao saves his penis for his girlfriend, Chika will have to bottom for Ryo. Though it takes convincing, Chika agrees to try. However, after doing it things become awkward between Ryo and Chika and Ryo ends up confessing his feelings for Chika.
Santarou's ordinary in every way except that his body gives off a scent that unnaturally arouses men. Because of this he is regularly fondled by his demon childhood friend Sukai, oil tycoon transfer student King, mysterious classmate Mimi, and the super perverted student council president Tomomatsu.
Ch.7-9: After his childhood friend Shimizu gets a girlfriend, Haijima realizes his feelings for Shimizu and has his heart broken. At the same, their friend Hachiya has realized his own feelings for Haijima
Haruhito has been secretly watch teacher-in-training Yuya. Though Haruhito thought no one would notice, his stares were seen by Haruhito's kouhai and Yuya's younger cousin Yuma, who offers to help Haruhito win over Yuya. However, when they discover Yuya has a girlfriend, Yuma instead offers to become Yuya's substitute.
After the death of his actor father, Hikaru discovers he has 8 illegitimate half brothers and, in order to receive his inheritance, Hikaru must get in contact with all 8 of them. As things progress Kikaru finds his heart torn between the sex addict lawyer Shimogura and his senpai and best friend Ashinuma.
Ch.2: Hirotoshi wants to become more mature, so he can win over doctor Sasaki. When Sasaki's old acquaintance Mizuno shows up, Hirotoshi is feeling more insecure than ever. However, Sasaki isn't the one Mizuno is after
Ch.1-2: While masturbating with his friend Tsuchida's shirt, Sanjou is caught by Morino, who Sanjou has noticed recently. As Sanjou spends more time with Morino, due to being blackmailed, Tsuchida gets jealous and confesses his feelings
Ch.1-2,6: Shina is always forced to help his ero-mangaka friend Mandayuu with his work. While helping by modeling for him, Mandayuu confesses his feelings and takes Shina
Ch.3-5: After becoming the tutor for his boss's son Seiichi, Shina is reunite with Iwabe, his crush and senpai from high school who rejected him. Now, Iwabe is forcefully pursuing Shina, but Seiichi, who likes Iwabe, gets jealous
Ch.1-2: Psychic Yuuma is currently possessed by a spirit who wants to use his body to confess to and have sex with Yuuma's childhood friend Ritsu
Despite being popular, Takumi rejects all confessions, since he's in love with his art teacher and older brother Ryuta's friend Jun. However, Jun is in love with Ryuta. When Ryuta gets engaged, Takumi uses his similarity to Ryuta to seduce a heartbroken Jun and offers himself as a substitute. Though his plan works, things get more complicated when Jun's college sex friend Tomoharu shows up
Chika-chan to!