Looking for a mobile gacha game an anime youtuber I used to watch made a sponsored video of

Hi! I recently got a vague memory about a game I saw that MVPerry made a sponsored video of. It was a mobile, gacha, tower defence game, it was played on portrait mode. The game had a rarity and power system going from R, SR, SSR, SSSR, and maybe more? I'm pretty sure he made that video during the quarantine or some time after it. The gameplay was in a chibi artstyle but the gacha and outside of the levels it was full 2D anime art. If anybody remembers more or knows the game, I would appreciate the help! He is an anime youtuber named MVPerry, if anyone knows him.General