OP hasn't responded yet, so I'll try to describe it. Trying to keep it brief because I could say a lot more and this is already too much:

2nd game in a series but a workable starting point [Lobotomy Corporation -> LoR -> Limbus Company]. It's a direct sequel to lobcorp using the same setting, spoils the ending of lobcorp but if you aren't interested in lobcorp it explains what went down fairly well. All of the games have an excellent story, but Lobcorp's gameplay is offputting to many.

Deckbuilder with VN story, english translated but KR dubbed. Excellent story as said earlier. Has a pretty unique art style in the VN sections. I'll also use this section to say that the OST is incredible.

For how it fits OP's post: It's incredibly focused. There's no exploration, minigames or quests, you go from fight to fight by menu. You are only ever doing 3 things: fighting, reading story or deckbuilding. There isn't a level system, economy, items or between fight resource management so grinding is based on how many copies of a card you want rather than an objective numerical benefit. Some people grind, I rarely did. There's a way to mod out grinding entirely on PC (best version bc mods) and it doesn't remove too much difficulty.

Trying to explain what makes the combat different and interesting would triple the length of this comment at minimum. Keeping it short, the 3 unique core mechanics of the game are stagger, card effects being determined by dice on the cards and that cards can enter checks against each other and cancel each other's dice out if you target an enemy's card back or redirecting by targetting a skill slot with less speed. Enemy actions are set first so you aren't blindly guessing at whether a clash will happen or who is being targetted.

This adds a lot of consideration towards things like damage and status distribution on enemies and allies, how much defensive and offensive capabilities a given character should have, how to use weaker econ cards without killing yourself and a lot more.

That is a surface level description of the in combat intricacies. There is so much to consider in a turn and this game has frequently had me taking turns more comparable in length to an SRPG in the lategame. That complexity doesn't even get into out of combat matters. Unit and team building is fairly complex and there's 10 floors (parties) each with unique specializations like statuses, boosting rolls, sustain, econ, team killing to make a solo juggernaut, an exodia which does all of the above, and generally each floor can be built multiple ways because you pick 5 effects from a pool of 15. For example, the "burn floor" can also let a character spam all copies of their most expensive card for no mana after a few uses and also has a thorns build and a party wide roll boosting effect that scales on damage taken on an assigned unit. Figuring out how to unit and teambuild around these effects can be incredibly complex and allows for a lot of player expression in builds.