Blue Friend.

ブルーフレンド

Blue Friend (Japanese: ブルーフレンド, Hepburn: Burū Furendo) is a yuri manga series written and drawn by Fumi Eban, and serialized in Shueisha's monthly shōjo manga magazine Ribon in 2010. It was followed by the one-shot sequel Blue Friend: After Days in 2010, and by the sequel series Blue Friend: 2nd Season and the spin-off Blue Friend: Nijiiro no Kanojo in 2011.