A new key visual depicting Seido vs. Inashiro and confirmation of GLAY returning to perform the opening theme accompanied the announcement that Act II -Second Season-'s second cour would premiere in October 2026, continuing directly from cour 1's cliffhanger.
Ace of Diamond Act II -Second Season- began its first cour on April 5, 2026, sending Seido into the spring invitational at Koshien Stadium; the 13-episode cour closed on the brink of the Western Tokyo tournament final.
A second promotional video ahead of the April 2026 premiere revealed a new cast member alongside the season's main theme songs.
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