This game is a nice way to relax and enjoy some extra dialogue between characters you enjoyed from the danganronpa series, but after having seen all of the events you'll likely fall into a monotony of doing the same thing over and over to either work your way towards some form of achievement or just try to advance the plot a little further. But, all in all, it's a fun game as long as you remember to try and mix things up a bit.

Look, I played through UTDP in danganronpa v3, beat the entire thing and even grinded for extra couple hours to develop all the characters in the game for a little bonus dialogue. If we don't count the schizo grind in the end, it was ok, the dialogue brought joy, the cross-series interactions were welcome and exciting, even though it's all silly non-canon for-funzies stuff.
In this game, I can't really fathom the amount of grind compared to the UTDP mode. You have 68 characters, each one takes 15-20 minutes to develop, there's a high chance you roll garbage even if you have U-cards, so the development doesn't guarantee further tower progression, the amount of pulls you get is minuscule with how many hours you have to put in, I just have massive hoyoverse games Vietnam flashbacks in this one and it's sickening. And the few fun interactions in each 15-20 minute run don't make up for the soul-draining non-stop grind.
Too long, very boring, filled with frustrating RNG and insanely slow progression which is already driving me crazy 20 hours in (I spent approximately 40-50 hours in Ultra Talent Development Plan and only started losing my mind after clearing the final boss, where I decided I'd develop all the remaining characters for the achievement).

I bought this game purely because I thought it was an expanded version of the post game content of Danganronpa V3 which I thought was one of the best parts of that game.

Unfortunately, this wasn't it for me. Please just save your money and go play Danganronpa V3 instead. It's version of this game play is so much better.

This game is just a terrible cash grab and I regret buying it.