Vanilla by SHIMOTSUKI Kayoko

This is a strange love story about a genius who is unable to erase his memories and an average girl.

Mika, an average female high-school student, falls head over heels for her beautiful violin teacher, Akizuki, who has the uncanny ability of "never forgetting something he's remembered once."

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Includes other works:

- Lion
- Room 1/4: Penniless Cinderella

From Storm in Heaven:

Ten years ago, there was an explosion at Hisano's apartment building. She would have been there, but she'd been hit by a bike ridden by a boy in blood-stained clothes. He dropped a fake gem when it happened, and she's been hanging on to it as a good-luck charm ever since. Now Hisano's in high school. One of her teachers was murdered, and the police are investigating. A young man suddenly appears carrying the toy the gem belonged to. And perhaps... can he also see the hallucinations Hisano has always been plagued with? Everything is connected as the pattern slowly rises to the surface.

From StarryHeaven:

When you have worries, is it about whether or not you are short or about your new class? Those were the problems that normal high school student, Chiyoko, faced. However, one day she meets her childhood friend Chiharu and Chiyoko’s world changed. But when Chiyoko stumbles her way into a secret underground high class club, she is surprised to find the truth…

From KakerA Translations:
In order to realize her dream of a romance with her sempai, Meiko uses black magic. Unexpectedly, she summons the demon king Lucifer, who also ends up as her homeroom teacher!
As part of their contract, Meiko is forced onto the path of a witch, but in reality, she's just Lucifer's slave! And now that she has magical powers, she activates her super strength whenever she eats Anpan. What will become of Meiko and the great demon king Lucifer?