Madarame-sensei no Mousou Gakkyuu Nisshi
Madarame is a teacher who has a really strange personality. Whenever she is in trouble or has to make a decision, her minds splits into three parts—a leader, a maiden, and a slob—who argue about the outcome. When her boyfriend breaks up with her, she goes a bit wild. She cuts her hair, and then goes out and gets in a fight, ending up dumped on a pile of trash. At her lowest, one of her students, Sena, rides up on a "white horse" bicycle and takes care of her wounds. Is her student Sena her prince on a white horse, finally come, or is that just ridiculous? Now, Madarame has an absurd crush on her student that she just can't seem to shake. (Source: MangaHelpers)
The story centers on the supporting character Tachibana from Saraiya Goyou during his childhood.
Siva no Yoru
By day, Shiba Takumi is the head psychotherapist of a police headquarters infirmary. By night, he kidnaps people and messes with their minds in the name of justice and experimentation. He selects his subjects carefully to be people who make the world around them a worse place. Then he drugs them and whisks them away to his laboratory, where he subjects them to an experimental treatment that changes their personalities. It doesn't always work exactly as he intends, but there's always tomorrow to try again... (Source: MangaHelpers)