So... is A3! Season Spring & Summer finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 29, 2020
Manga finished: July 28, 2021
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
A3! Season Spring & Summer
Anime - Base
Release date: January 14, 2020
A3! Season Autumn & Winter
Anime - Sequel
Release date: October 13, 2020
Synopsis
Izumi Tachibana inherits her father's struggling theater company, Mankai Company, only to discover it's on the verge of collapse due to massive debt.
To save it, she makes a deal with a debt collector: stage a successful debut performance with four revitalized troupes, and pay off the debt within a year.
Becoming the company's director, Izumi quickly assembles the Spring Troupe, a group of five inexperienced but eager young men, including a devoted student, a lovesick boy, an aspiring writer, a mature office worker, and a cheerful foreigner.
Now, Izumi must train these novices and guide them towards a show that can revive the Mankai Company and restore it to its former glory.