>>664929According to mangadex
>Psychological manga delve into mental or emotional states of a character in the midst of a difficult situation, letting you observe them change as tension increases. Internal monologues are a key feature, allowing narration to delve into a character's mind, revealing their innermost ideas and motivations - even as they may be driven to the brink of sanity.I don't see how it's a genre and not just a feature of any good manga, but whatever.
Beastar is apparently "psychological" and very good either way, so read that.
Girls Last Tour, idem.
Ahah, I even see "Touhou - The Immortal Who Saw the Death of The Universe" listed on as psychological on mangadex, you should read it even if you're not familiar with touhou, it's short but glorious.