Kentarô Ohtani

A chance encounter between two girls of the same name, "Nana," triggers a series of events and relationships. (imdb)

Follows the struggles through life and relationships of Komatsu Nana and Osaki Nana. (imdb)

An orphaned aristocrat summons a demonic butler to aid her, at the price of her soul. (imdb)

The story reveals the history of "Black Jack" when he was a medical student, how he became an unlicensed doctor, and his rivalry with Dr. Kiriko. (mydramalist.com)

Kumi is a transfer student at a prestigious high school. She meets Hyo who is handsome and kind. Kumi falls in love with him and has her first kiss with him, but Hyo is famous for being a womanizer at school. After she discovers his true side, she gets hurt, but her feelings for him don't go away.

A high school girl, Sei Saotome, unexpectedly is transferred to an elite high school in Nagano prefecture due to her parent's house moving. One day, she meets Mizuki and Taiyo and is invited to join the astronomy club with them. The personalities of the two boys are completely opposite from each other. Sei, Mizuki, and Taiyo struggle with the sorrowful and impatient love triangle...

Seung Ho goes to Japan to meet with his first love. There he stays at Miu's house. Then love begins between them.