The Angel Next Door Spoils Me Rotten 01 (Manga) by Saekisan

Could these lonely neighbors be a match made in heaven? A cozy teen romance based on the novels that inspired the hit anime!

Amane Fujimiya lives alone in a messy apartment—right next door to Mahiru Shiina, a veritable "angel" who's the smartest, prettiest girl at school. When a chance encounter on a rainy day draws them together, Mahiru finds herself spending more and more time helping Amane get his life in order. And though they both insist they have no intention of dating the other, slowly but surely, something more than friendship begins to blossom.