This is R-18 rated hentai side story by the author of I Brought Home a Succubus Who Failed to Find a Job, intended to show the first sex experience of main characters of his main manga.

1-9. Sore wa Rekishi ni Kakanai de! (Don't Write That Down in History!) 1-2, 2.3, 3-4, 4.1, 5-6, 5.9 An Ancient Egyptian scholar is revived and conned into "tending" to an otaku. Afterwards, she lives in with...

Akira-kun receives a very surprising visit. A succubus that is after his body fluids. Blood? Well, not exactly… Read Japanese and Official English Version on Fanbox

A guy mistakes a girl in his room to be in succubus cosplay, so he entertains the idea, and the happy time begins...

A cat-girl breaking in to use a toilet of a bachelor. Then other half-animals are chasing after her, destroying his room in the process. What does that girl hide and why does she approach him?

1-7) Tentacle Lovers A popular princess is attending school and every guy falls in love with her, including the main character, Asakura Kengo, who gets a letter to meet her after school. Through some magic...