Oshiete Katekyo
childhood friend comes back and tutors him, sets up cameras, blackmails with photos, crazy, etc
Sankaku Opera
A piano teacher loves a student but another student finds out and blackmails the teacher, both students are with the teacher who then quits and runs away then they find him and end up all together.
otona gokko(UEDA Niku)
A guy is rumoured to be a prostitute because of all his sex freinds and his sex adiction. He tries to remain a loner but a transfer student is insistant on becoming friends then they become a cute couple. -a guy falls for his cold teacher who smiles at cats and plants and they get close
Gozen 0 Ji no Ookami Koushi
a student helps a teacher clean and falls for him and he likes him back so when the school year ends they end up together. U jealous of S and girl but it was his sister. -yakuza family with adopted son taking over as a lawyer when other kid leaves for america because he liked his brother. H ecomes back and helps take over the group.
Isso Mou, Kudokitai!