Love One Hundred Years Strong

Harume Nihei was compared to a rolly polly by her crush, Maki, when she mustered up the courage to confess to him back in preschool. Ten years later, she still hasn't gotten over him. This time around, she's been doing her best to get Maki to confess to her instead. But with him being the biggest airhead of 'em all, it simply won't be an easy task! An adorable tale of two childhood friends secretly (?) in love with one another, and their absolutely ridiculous adventures fraught with misunderstandings.

(Source: MangaPlaza)

Note: Originally a three-chapter short-story published in Hana to Yume ending 2024-02-05, serialization was extended on Manga Park starting 2025-06-08.