Chiisana Koi no Monogatari: Chitchi to Sally Hatsukoi no Shiki

RomanceSlice of Life

Score: 5.4/10
Mean: 5.8/10
Episodes: 1
Season: 1984

~71 min per ep

Trailer

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About

Tiny schoolgirl Chiiko develops a crush on older boy Sally and believes herself to be his girlfriend, although Sally is already involved in a love triangle with a girl called Tonko.

(Source: The Anime Encyclopedia)