1. Aria's Egg (Itou Hachi)
2. My Friend's Little Sister (Namori)
3. Melon melon (Takemiya Jin)
4. Because I'm an Adult! (Nonaka Yuu)
5. The taste of my first kiss (Irua)
6. Leave It to the Super Maid (Takeshima Eku)
7. Princess Knight and Familiar (Takano Saku)
8. The Mistress’s Selfishness (Homura Subaru)

The stage is a modern school that fosters female officers, "Girl's Only Army School".
A girl, Indou Shinobu, who came out from the countryside, meets Kagami a high-class senior student.
Contrary to her high-handed attitude, Kagami occasionally shows kindness to Indou.

From MyAnimeList: https://myanimelist.net/manga/107205:
A student frequently visits an amusement park on her own, until one day the princess she had always been fond of appears in front of her.