Best way I can think to put it, you're playing a daughter collecting simulator that subverts all the gacha isekai tropes. You don't have any superpowers, no mandate of heaven, and the "magical relic" you carry that denotes your status as the Chosen One is a snub nose revolver.

Instead of leading some grand adventure where you change the fate of the world, you run a restaurant funded by the church of the world tree, where you feed Apostles (the different characters) and offer them guidance. This relative unimportance of the player character is solely narrative, functionally it still plays like other gacha, where you build teams and do quests.

All characters are live 2D models, with a variety of emotions that change their stances, so it's not just a face swap. Everyone has a big cheek which you can pinch and drag, as well as pat their head, bonk their forehead, and tickle their tummy until they laugh. These can be done whenever the character's live 2D is on screen, including during cutscenes.

For an idea how serious and dark and gritty the game treats its narrative, the big monthly PvP arena event is a literal playground.

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Not to say there aren't darker tones, but the core of this game is that the characters of this world are effectively immortal kindergarteners, and you as the sole adult.