The game is somewhat an idle RPG. When you start the game, tutorial is only in Japanese. You have to click through each menu (written in vertical but arrange in horizontal fashion) before you can really start your adventure.
You start with 3 heroes and some equipments. You have to equip them yourself. You can summon new heroes but it will cost souls. There are 3 sizes of soul - small, medium, and large. You get souls by waiting for it to generate. You can level up soul generator by spending small souls and gold.
You can level your hero by going out to dungeon or using gold. You get equipments from monster drops only. There are 4 qualities - normal, magic, rare, and legendary.
Overall the game has depth. It is very interesting and I’m still learning the game.