Hyakunen no Koi mo Sameteshimau(1992)

Hyakunen no Koi mo Sameteshimau

Fifth-grade girl Shoko likes Nitta-kun, the son of a fishmonger. Even though she has other rivals, Shoko is seated next to Nitta at school, so she has a definite advantage! However, one word from her mom changes her mind drastically... See how Shoko comes of age in this girlish love comedy! Also contains the one-shot NO,NO,YES.

(Source: Shueisha, translated)