When I went to Japan a few years back, one of my life-changing moments was experiencing a tankless TOTO washlet. When I walked into the bathroom, the lid opened automatically, and the seat was heated. It made “going” a truly pleasant experience. And without getting into the grisly details, as you’re doing your business it automatically cleans the inside of the bowl, cleans the air, and…cleans you. It’s an experience most of us in the US cringe at, but as I like to say, once you’ve taken a crack, you’ll never go back.
Judging from the image in the game, it's almost certain that the developers based this tankless toilet on TOTO's iconic G450 washlet.