One day, Amane notices a girl, Mahiru, soaking in the rain. He gives her his ...
The Angel Next Door Spoils Me Rotten
Season 1 Episode 3: Reward for the Angel
Amane's mother Shihoko unexpectedly visited and found Mahiru hiding in his room. Assuming Mahiru was Amane's girlfriend, she treated her warmly. Seeing Mahiru's happiness when addressed by her first name, Amane also started using it.