お隣の天使様にいつの間にか駄目人間にされていた件

Amane Fujimiya lives alone in a messy apartment and keeps to himself, scraping by on convenience-store meals. Next door is Mahiru Shiina, the smartest and prettiest girl at school, the one everyone calls the Angel. After he lends her his umbrella one rainy afternoon, Mahiru starts repaying the favor by cooking and cleaning for him. Two classmates who barely spoke begin sharing meals and quiet evenings, and the distance between them closes without either one admitting it. This manga adapts Saekisan's light novel.