>>3318382>Is it even an anime? Is it some gatcha game?It's both, but originally came out as a game. There's also the live action musicals that is its own beast. An important thing to note is that each adaptation has a different interpretation of their personalities.
You can glean a bit of who they are from their lines in the wiki, but if you really want a more visual representation of how they act and move, the musicals are the way to go.
>I'd just like a quick run down of what I'm getting into.Basically Sengo is the flashier of the two, he's a depraved slut who's always offering to strip naked and Tonbokiri is his more stern and serious brother of sorts who tries to keep him in line. I say brother of sorts because they were made by the same guy, so technically it makes them related.