Otasuke Chara ni Kanojo ga Iru Wake Nai ja Nai desu ka (Light Novel)

My classmate Shougawa-san has a secret that no one must uncover... That’s right, she is actually a Radiant Magical Girl that protect this city! (And she’s super cute!) I found out this secret by accident, and to avoid her identity from being exposed, I vow to cover up for her, but she is a really clumsy ditz! In order to better support her, I must be mentally prepared to stay by her side at all times…