aiko Turns School Memories Into an Opening Theme
The opening theme, "Anata no Hana no Iro" (The Color of Your Flower), comes from aiko, the singer-songwriter whose "Koi wo Shita no wa" served as the theme song for the 2016 film A Silent Voice. In a comment shared with the announcement, she recalled a student life that revolved entirely around school and her own bedroom: laughing with friends until her stomach hurt, or writing a late-night letter to a crush only to reread it the next morning and throw it away. "It became a song where my present self and my past self both exist," she said, adding that she hopes it plays inside the hearts of Taiki and Chinatsu too.
The ending theme, "blue in," is by Elsewhere Kikou, a two-member band that already has history with this series. Vocalist and guitarist Sō Anno sang in an anime for the first time on "Koiiro," an insert song from episode 24 of the first season, after an offer from composer Takashi Ohmama. In their comment, the duo said they wrote the ending around the straightforward yearning the series carries, along with the pain and kindness of facing things head-on, and that they hope listeners can entrust a little of their faint-heartedness to the song once the broadcast starts.
Both tracks can be previewed in the new main trailer.
A Snowbound Chinatsu and a Newcomer Named Yumeka
According to a report from Japanese anime news site Anime Anime, the new key visual shows Chinatsu lying on the snow in the stillness of winter, looking straight at the viewer with light caught in her eyes. It is a quieter, more dramatic image than the sports-forward art that defined the first season's promotion.
The main trailer introduces Yumeka Kido, a new character who appears before Taiki and Chinatsu and stirs up trouble. She is voiced by Yoshino Aoyama (Hitori Gotoh in Bocchi the Rock!). The footage follows the cast through changing seasons as relationships shift and feelings waver, which tracks with the visual's move from summer courts to winter snow.
A New Studio Takes Over the Adaptation
Blue Box adapts Kōji Miura's manga, which ran in Shueisha's Weekly Shonen Jump from April 2021 until its finale in July 2026. The story follows earnest, relatable characters throwing themselves into club sports while capturing the small movements of the heart that come with falling for someone. The first anime season aired in two back-to-back cours starting October 2024.
Season 2 changes hands behind the scenes. Daisuke Sakō directs at studio Electric Circus, taking over from season 1 director Yuichiro Yano and Telecom Animation Film, with planning and production credited to UNLIMITED PRODUCE by TMS. Key creative staff return, though: Yūko Kakihara is back on series composition and scripts, Takashi Ohmama on music, and Miho Tanino handles character design and serves as chief animation director.
The returning cast stays intact. Shoya Chiba voices badminton player Taiki Inomata, Reina Ueda plays basketball star Chinatsu Kano, and Akari Kitō is Hina Chōno, with Aoyama's Yumeka joining them.
Looking Ahead
Blue Box Season 2 premieres October 4, 2026, airing Sundays at 4:30 p.m. across 28 TBS-network stations in Japan, with domestic streaming starting the same day at 5:00 p.m. on Netflix, dAnime Store, U-NEXT, and more than 20 other platforms. Internationally, Anime News Network notes that the season begins streaming on Netflix in October; season 1 streamed worldwide on the platform.
English-language readers can catch up on the manga through Viz Media, which publishes the series in print and on the Shonen Jump app, while Shueisha simulpublishes chapters on Manga Plus. In Japan, volume 27 arrives October 2 and the final volume 28 lands December 4, 2026. The first exhibition dedicated to the manga runs at Nagoya's Telepia Hall through September 27.