One of the best Anime/mangas in the last Years:

Demon Slayer: Kimetsu no Yaiba – Hinokami Keppuutan for PlayStation 4. by CyberConnect (Naruto: Ultimate Ninja Storm series and Dragon Ball Z: Kakarot developer)

Anime slays hard that's for sure

CyberConnect are the Best :)
And i want a One Piece-Game with true Anime-Design by this studio, like Naruto UNS :)

Its CyberConnect2.... Its most likely another arena fighter. If its not, ill be interesed.

Battle Shonen gets translated into Arena fighter ... rinse n' repeat at this point. Though Cyber2Connect so it'll be good !

Can't think of an Anime to game I've ever enjoyed.

I love Cyberconnect 2 mainly from Asuras Wrath and the Tail Concerto series.

Well they just recently made Kakarot, so if this is also an action rpg, I'd be interested as well.

Kakarot is still a arena fighter. Dont let the adventure elements fool you. 

I've played and finished the game. I spent the majority of the time not fighting. Let alone in an arena.
There's no way to play with or against another person, etc.