Having lost her mother at a young age, Misha Takanashi, a second grader who is Russian now lives with her Japanese step-father. Tsubame Kamoi, formerly a Japan Air Self-Defense Force, JASDF officer, comes to the Takanashi household as a housekeeper. This is a home comedy where Kamoi, a hardcore lolicon, attempts to get near Misha as she tries to fight against her.

College student Miyako Hoshino is quite shy around other people. She mostly spends her time in her room making cosplay outfits. When her fifth-grade sister Hinata brings her classmate Hana Shirosaki home, Miyako instantly becomes captivated with Hana's cuteness. Miyako tries to do various things, ranging from making Hana wear cosplay dresses to giving her sweets. This gives Hana a bad impression of her at first, but Miyako will do anything to grow closer to the angel who has descended before her.

Hana, Hinata, Noa, Koyori, and Kanon are always good friends. Today, they are having a friendly sweets party at home with Miyako's homemade sweets! The flower-shaped cookies look just like the hair ornaments worn by Hana. The hair ornament was a precious treasure that Hana received from her grandmother when she was little, and everyone was intrigued by the story. And as practice for the school trip, they decide to go visit Hana's grandmother's house...! The first outing for everyone is about to begin. (Source: Crunchyroll News)

Hinata Hoshino, Hana Shirosaki, and Noa Himesaka are off to the countryside for a camping trip. At Hinata's behest, her elder sister, Miyako, reluctantly tags along. Seeing how gloomy Miyako is, the trio do their best to get her to enjoy herself too. Besides the camping trip, Watashi ni Tenshi ga Maiorita! Special contains three more short stories of the girls. Although their lives seem normal, one thing is certain: there is definitely no shortage of cuteness here!