Update: Blue Box Season 1 has now officially ended with Episode 25, which aired on March 20 in Japan. As expected, the season covered up to Chapter 80 of the manga, ending with Taiki and Chinatsu’s date.
Blue Box anime, based on Kouji Miura’s manga, is now in its second cour and has been confirmed to end with Episode 25 on 20th March in Japan, while in other regions Blue Box Season 1 will end on 27th March.
TMS Entertainment is producing the anime, while Telecom Animation Film is handling the animation, and Netflix is in charge of distribution.
So far, 22 episodes have been released, and Blue Box Episode 23 is scheduled to be released on March 6 (today) on Netflix Japan.
With only three episodes left, the anime is currently adapting the Autumn Training Camp Arc, which will be the final arc of Season 1.
Which Chapter Will Blue Box Season 1 End On?
Since the Autumn Training Camp Arc is the last arc of the season, the anime will likely end at Chapter 80.
The anime has been following a steady pace of three manga chapters per episode. As of now, 71 chapters have been adapted.

If this pacing continues, Blue Box Episode 23 will cover Chapters 72-74, Episode 24 will adapt Chapters 75-77, and the final episode (Episode 25) will adapt Chapters 77-79.
However, Chapter 80 does not have a big cliffhanger, so there is a chance they might adjust the pacing slightly and end at Chapter 79 instead, and end it at Taiki and Chinatsu’s date.
Will Blue Box Season 1 Cover Yumeka’s Return Arc?
As mentioned above, Blue Box Season 1 will most likely end with the Autumn Training Camp Arc.
There is a small chance they might adapt 1 or 2 chapters from Yumeka’s Return Arc to end the season on a good cliffhanger (teasing Yumeka’s return), but that seems unlikely.
Yumeka has not appeared in any trailer, and the official staff/cast list does not include a voice actor for her.
This means Yumeka won’t be in Season 1, and her arc will most likely be saved for Blue Box Season 2. However, as of now, there is no official confirmation about a second season.
Blue Box is a manga series written and illustrated by Kouji Miura, serialized in Weekly Shonen Jump. Manga Plus describes the story as:
Taiki Inomata is on the boys’ badminton team at sports powerhouse Eimei Junior and Senior High. He’s in love with basketball player Chinatsu Kano, the older girl he trains alongside every morning in the gym. One Spring day, their relationship takes a sharp turn … And thus begins this brand-new series of love, sports and youth!