Mahou Shoujo Nante Mou Ii desu kara.

Yuzuka Hanami maintains a simple life, even with her father’s overwork and her mother’s absence. She values her studies and cherishes her carefree lifestyle. Miton, a foreigner, can turn his partner into a magical heroine that saves the world from evil. However, he remains powerless due to the lack of adversaries. Miton lives in a dumpster, scavenging for food and shelter. When Yuzuka discovers Miton, he convinces her to join him, but she is hesitant before agreeing. Regrettably, after transforming into an ill-fitting swimsuit, Yuzuka begins to question her decision.