The Angel Next Door Spoils Me Rotten

お隣の天使様にいつの間にか駄目人間にされていた件

Follows the unlikely relationship that develops between two high school neighbors, the messy and socially awkward Amane Fujimiya and the beautiful and popular Mahiru Shiina, whom classmates call an "angel". After Amane lends Mahiru his umbrella during a rainy day, he catches a cold, and Mahiru insists on taking care of him, leading to a bond that grows as Mahiru helps Amane with chores and they start spending more time together.