1. High School Lullaby
The popular boy in class & a boy who plays the devil's advocate (has a girlfriend). ()
2. Shoujo C
I'm nothing special, but Koizumi-kun is a very special guy whose looks and personality are seriously those of an angel. He's our idol. This popular pair was introduced in "High School ☆ Lullaby" ().
3. Requirements for Being Trash
A first-love killer and a pure-hearted boy. ()
4. Taisoufuku o Nugasanaide
A boy wearing a facade of a pristine angel, Koizumi-kun, and the class’s disliked Kashihara-kun, and their changed relationship since the day they had sex.
5. Lonesome Neon Tetra
Kashiwabara-kun’s identity begins to crumble from (ill-natured) Koizumi-kun’s sexual harassment. But will he notice? There’s something deeper here at play…
6. Gakuen Tengoku
7.
8 Koizumi-kun wa Kangaeta