BL - Age Gap

Student x Teacher/Guardian
Riku fell in love with his teacher Nagi who became his guardian after his fathers death, but Nagi was in love with his father.

When Mizusawa get locked out of his house, he find his teacher Takatsu drunk on a park bench. Takatsu confesses that he's been watching Mizusawa since his first year and kisses him. At school the next day, Mizusawa begins teasing Takatsu. But when he hears Takatsu went to a marrige interview, be realizes he doesn't want Takatsu to be taken from him.

Sequel to Young Bad Education where Takatsu and Mizusawa, no longer a student, are now dating

While walking home from a drinking party, college student Serizawa finds two men kissing in an alley and one of them is his boring and straight-faced professor Utsumi. After blackmailing Utsumi into going drinking with him, he wakes up to Utsumi giving him blowjob. Serizawa finds himself captivated by the gap between Utsumi's apperance and personality.

Ch. 1-5,8: After seeing his teacher Someya crying on a snowy day among cherry blossoms, Takada begins to approach him frequently. The more they talk, the more interested in Someya Takada becomes.
Includes two one shots:
Ch. 6: Yamashita takes his drunk coworker Seto home and a crying Seto kisses him, calling him by another person's name
Ch. 7: Asaya and Yuu, friends who hid their feeling for each other, are reunited on the train and are burdened by their feelings once again

After Ikuta's confession to his crush goes wrong due to inadvertently insulting her, Ikuta is brokenhearted to find out his crush likes their popular teacher Shizu. Shizu gives Ikuta advice on how to confess properly, despite his rudeness toward Shizu, and Ikuta is able to confess again. When Ikuta apologizes to Shizu for his attitude, Shizu plans to make Ikuta show his sincerity by having him become his servant at school.

Unassuming student teacher Tsukioka becomes concerned about Usui, an overdressed student covered in bandages.

Almost every summer since tenth grade, college student Ryuuta has worked at a small beach-side resturaunt run by his Naoki. Ryuuta love for Naoki grew more every year, but Naoki had always been in a happy relationship with his girlfriend Hana. Ryuuta decide to make this year his last, so he can finally give up, but when he shows up Hana is no longer around. With Hana gone, Ryuuta is unable to hide his feelings for Naoki and confesses.

Hara hates anything troublesome, so to avoid others, he debuts as a delinquent in high school. While skipping class behind the old school building, he meets school janitor Sugimura, also avoiding others, and they spend every Friday ignoring each other. However, when Sugimura reassures Hara after seeing him forced to masturbate for his senpai and then saves him from a senpai's attempted rape, Hara asks Sugimura to be his friend. Sugimura suddenly reveals he's a ex-convict, convicted of rape.

Insomniac author Tatsumi was often visited by 10 year old Subaru and, though initially annoyed, Tatsumi began to enjoy the noisiness and warth Subaru brought. However, Subaru was forced to move overseas due to his parents work, but promised to return as an adult. While waiting for Subaru, Tatsumi wrote a love letter in the form of a best-selling novel and sent it to Subaru, expecting him to not return after reading it. 10 years later, Subaru has shown up at Tatsumi's door.