Fenriru Nesan to Boku Manga

Alternative(s): Big Sister Fenrir and I; Fenrir-nee-san to Boku; フェンリル姉さんと僕

Author(s): Azaki Momoko

Status: Ongoing

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02/27/2019 Update
Useless guy likes popular girl. Supernatural accident occurs. Popular girl saves useless guy. But it turns out the girl was actually the legendary mythical beast Fenrir and he's her little brother?