Blue Box Ep. 21 “A Chance to Blossom” carries multiple meanings. The first meaning comes from Chinatsu, and is only apparent when you look at her scene in a romantically philosophical context. The second meaning comes from the newly introduced Ayame Moriya, who is also getting a chance to blossom as a new main character by being the new manager on the block.
Blue Box Ep. 21 “A Chance to Blossom”: Details

Blue Box Ep. 21 “A Chance to Blossom” is the ninth episode of the second cours (you can read my reviews of Ep. 13, Ep. 14, Ep. 15, Ep. 16, Ep. 17, Ep. 18, Ep. 19, and Ep. 20 here) of this romantic comedy and sports anime, and is the 21st episode overall. You can read my reviews for Ep. 1, Ep. 2, Ep. 3, Ep. 4, Ep. 5, Ep. 6, Ep. 7, Ep. 8, Ep. 9, Ep. 10, Ep. 11, and Ep. 12 of the first cours here.
Said anime is the anime adaptation of the manga of the same name by Kouji Miura (I Love You, My Teacher). Telecom Animation Film (Tower of God, Shenmue: The Animation, Astro Note) and TMS Entertainment (Detective Conan, Lupin the Third, Anpanman) are both responsible for the anime, with them doing the animation, and production and planning, respectively. Netflix is the company licensing this anime for its global release.
Production Cast
Yuka Yamato is the director behind Blue Box Ep. 21 “A Chance to Blossom”, with Yamato also doing the storyboard alongside Yūichirō Yano. As for Blue Box as a whole: Yūichirō Yano is the director behind the anime. Yūko Kakihara is the writer, Miho Tanino as the character designer, and with Takashi Ohmama responsible for composing the music.
Speaking of music: the second cours now features as the opening theme song “Saraba” (然らば) by Macaroni Empitsu. Meanwhile, “Contrast” (コントラスト) by TOMOO is the new ending theme song.
Voice Cast
Blue Box Ep. 21 “A Chance to Blossom” features the voices of Shōya Chiba (Zach Aguilar in English dub) as Taiki Inomata, Reina Ueda (Xanthe Huynh in English dub) as Chinatsu Kano, Chiaki Kobayashi (Caden Shaffer in English dub) as Kyo Kasahara, Akari Kitō (Kayli Mills in English dub) as Hina Chōno, and Kana Ichinose (English dub voice unknown) as Ayame Moriya.
Other notable voice roles in this episode include Haruka Shiraishi (Cristina Vee in English dub) as Karen Moriya, Yuma Uchida (Daman Mills in English dub) as Kengo Haryū, and Shogo Sakata (Jacob Hopkins in English dub) as Ryōsuke Nishida, Asaki Yuikawa (Kira Buckland in English dub) as Niina Shimazaki.
When and Where to Watch
Blue Box Ep. 21 “A Chance to Blossom” made its airing and streaming debut (aka. simulcast) on February 27, 2025. You can watch this episode of the anime only on Netflix. In fact, you can only watch this entire anime on Netflix due to it being an exclusive there.
Blue Box Ep. 21 “A Chance to Blossom”: Synopsis
Alas, Blue Box is still an ongoing anime series. In fact, Blue Box Ep. 21 “A Chance to Blossom” only made its debut five days ago as of this writing. Thus, I will present to you Netflix’s official synopsis for this episode instead of a spoiler-filled plot summary. You can read that synopsis below:
While rumors swirl around Taiki and Hina, Chinatsu seems unfazed. However, while spending the night at Karen’s, the basketballer shares her true thoughts.
Blue Box Ep. 21 “A Chance to Blossom”: The Good

As is the case with previous episodes, it’s the story of Blue Box Ep. 21 “A Chance to Blossom” that has captured my attention. Mostly because we’re seeing the romance from Chinatsu’s perspective most of all. Yes, Taiki’s perspective does get a lot of attention in this episode, but Chinatsu’s perspective shares the spotlight. We even get to see her own views on romance, especially her own. It’s all a fascinating outlook on romance in general, but especially because it’s coming from a teenager who’s busy developing her own ideas about romance while sorting out her own feelings on the subject. All in all, it definitely feels as though Kouji Miura is being quite philosophical about the nature of romance, and it makes this episode a fascinating watch because of that.
And then of course, there’s the integration of Ayame Moriya to the main cast. You might be wondering just why am I so focused on her? Well, it’s because as a fan of the manga, I’m aware that she becomes a critical member of the core cast of main characters. She’s an odd one at first, but she quickly becomes very likable due to her own struggles with romance. All in spite of seeming quite vapid at first glance to boot.
Of course, we also have the animation from Telecom Animation Film and TMS Entertainment to complement that story. The animation continues to be of very high quality. On par with a lot of feature-length anime films, really. Seriously, when you look at the way the lighting hits characters and can instantly know what time of day it is and where they are at the moment, then you know you’re dealing with an animation team that spent a lot of time and effort on that lighting.
Blue Box Ep. 21 “A Chance to Blossom”: The Bad

Alas, those of you who watch this anime only for the sports action might find Blue Box Ep. 21 “A Chance to Blossom” to be a bit boring. There’s basically no sports action in this episode aside from some calm practice basketball, and that’s only for a brief moment. If you want some heart-pounding action, then might I suggest watching Demon Slayer: Kimetsu no Yaiba, Solo Leveling, Kaiju No. 8, DDDD, DAN DA DAN, and/or Zenshu? Those anime series should contain enough action to satisfy your inner action junkie until the next time Blue Box returns to that sports action.
Tune back in to THS to find out more about Blue Box and other anime when we do. If you agree or even disagree with my review, leave your words below in the comments section.