"Itsu Datte Bokura no Koi 10 Centi Datta" is a short anime series that explores the evolving relationship between two childhood friends, Aoi Sena and Haruki Serizawa. The story begins with Aoi, a reserved and introverted girl, and Haruki, a cheerful and outgoing boy, who have been close since elementary school. Their bond is rooted in a shared memory of measuring their heights together, marking their growth over the years. This ritual becomes a symbolic representation of their connection and the passage of time.

As they grow older, their relationship begins to shift. Aoi harbors unspoken feelings for Haruki, but her shyness and fear of rejection prevent her from confessing. Haruki, on the other hand, remains oblivious to her emotions, treating her with the same casual affection as always. The narrative delves into the complexities of their dynamic, highlighting the tension between Aoi’s longing and Haruki’s carefree attitude. The series captures the subtle nuances of their interactions, from playful banter to moments of quiet introspection, as they navigate the challenges of adolescence.

The story progresses through a series of vignettes, each focusing on a specific moment in their lives. These moments range from mundane everyday occurrences to significant events, such as school festivals and graduation. Through these snapshots, the series portrays the gradual evolution of their relationship, emphasizing the emotional weight of unspoken words and missed opportunities. Aoi’s internal struggle is a central theme, as she grapples with her feelings and the fear of disrupting their friendship.

The title, "Itsu Datte Bokura no Koi 10 Centi Datta," reflects the recurring motif of measuring their heights, symbolizing the incremental growth of their bond and the slow realization of their feelings. The series concludes with a poignant resolution, as Aoi and Haruki confront their emotions and acknowledge the depth of their connection. The narrative remains grounded in realism, avoiding melodrama and instead focusing on the quiet, heartfelt moments that define their relationship. The characters are portrayed with depth and authenticity, making their journey relatable and emotionally resonant.