Complete course

Kouhai (student council vice president) x senpai (student council president)
The second-year student council president had always been a pervert magnet with guys groping and sexually-assaulting him every day. When his kouhai and newly appointed vice president saw him in the train, he promised to take him to and from school to swat away perverts.

Human student x vampire teacher
When he found out his cram school teacher was a vampire, he was somehow drawn into him and allowed him to suck his blood. But as he fed on him, his teacher knew he was getting hurt and weak.

Childhood best friends turned lovers
When Fumi suddenly exclaimed he might be gay and that a guy confessed to him and he might go out with him, Shunpei was both bothered and curious. Why was it not him, Shunpei thought he even seduced Fumi to do it with him. But Shunpei was straight. Was it just his childish possessiveness or was it something more?

Sequel of Ringo ni Hachimitsu
Kouhai x senpai
Natsuki was a boy with a girly face and had always been called homo, which he was. Komano was straight and popular. But they were going out and Natsuki was insecure about a lot of things.

A private detective agency of some sort consisted of four members: Yamato, a former special ops squad member of the army, Kippei, an abandoned child who specialized in the technical stuff, Tamaki, a handsome hairdresser who used to pickpocket, and Sougo.

Student x doctor
A student 10 years younger, came from a rich family, and an asthma patient of his, took a great interest in dr. Narusawa and raped him before he moved to Tokyo. But that was the start of their on-and-off relationship.

Multiple stories.
1. In the intelligence where the agents worked in honey trap missions, they're divided into Top and Bottom Class and paired to "train" their sexual technique. But his partner seemed to dislike their training...
2. Working in the ministry, he hated the guts of a certain coworker who teased him a lot.
3. He wasn't as docile and obedient as he looked while the other wasn't as cool as he appeared. Two men with a mismatch between their looks and appearance met.

Boss x secretary
He used to be the companion of his father's boss' son. But when he was confessed to, he ran away. Years later, he was appointed as the secretary of the vice president in his company, who was none other than the same boy he ran off from.