Once most students are done with high school, they leave and never come back. However, at 25 years old, Hana Natori finds herself in the role of a student once more at her aunt's request. Since Hana's cousin, Kaho Miyoshi, refuses to go to school, her aunt begs Hana to take Kaho's place, since the two of them are practically identical. But as luck would have it, she is recognized by Okito Kanie—an old classmate from her days in high school—who is now a teacher! With her cover blown, Hana assumes Kanie will expose her secret. But when he suddenly kisses her, she soon learns he has other ideas.
An Unexpected Reunion
In the Nurse's Office Bed
The Secret After-School Lesson
On the Night of the Class Reunion
How Could I Have Lost Those?!
I'm Going to Be Found Out!
Private Study Session
On That Day, at That Time, in That Place
That Morning, Just the Two of Them
Is That Jealousy?
The Worst Day
I Love You!
Otona Joshi no Anime Time
I Left My A-Rank Party to Help My Former Students Reach the Dungeon Depths!
Arpeggio of Blue Steel: Ars Nova
Tesagure! Bukatsumono
Muteking the Dancing Hero
The Case Study of Vanitas
Ef: A Tale Of Memories & Melodies
The Diary of Ochibi
Lime-Colored History of War
Moyashimon
Orb: On the Movements of the Earth
ろぼっ子ビートン
Akiba Maid War
Bannertail: The Story of Gray Squirrel
Oh! My Goddess
Devil May Cry
Tom & Jerry Gokko
Tadaima, Okaeri
Summer Pockets
May I Ask for One Final Thing?