Dengeki Daisy

Dengeki Daisy (Japanese: 電撃デイジー Hepburn: Dengeki Deijī , lit. “electric shock daisy”) is a Japanese shōjo romance manga by Kyousuke Motomi. It is published in Kyoto, Japan in Betsucomi magazine and has been published into sixteen tankōbon. The series is licensed for English release in North America , with the first volume published on July 6, 2010.

When Teru Kurebayashi’s older brother died, she was left only with a cell phone that connects her to DAISY, someone her brother promised would support and protect her when her brother is gone. DAISY soon becomes her greatest confidante and pillar of strength.
When Teru accidentally breaks a school window, she winds up becoming the “servant” of the sadistic school janitor, Tasuku Kurosaki. As she begins working for the unlikeable Kurosaki, her feelings for him change and she begins to question DAISY’s true identity.