Watashi ni Tenshi ga Maiorita!

Shy college student Miyako Hoshino prefers staying home, sewing cosplay costumes, and avoiding strangers. Her quiet routine changes when her energetic little sister Hinata brings home classmate Hana Shirosaki, whose cuteness immediately overwhelms Miyako.

Miyako desperately tries to befriend Hana through homemade sweets and elaborate costumes, but her awkward enthusiasm only makes Hana suspicious at first. As Hinata's circle of friends grows, Miyako is repeatedly pulled out of her comfortable isolation and into a lively everyday life full of embarrassing misunderstandings and unexpected warmth.