was reading and my computer crashed so hard that I had to do a factory reset, and I forgot the name of what I was reading... Starts off with mc's terrible dad dying and leaving a fortune to mc (in cash). mc locks himself away to play games and eventually gets sucked into a game where he is the 71st demon lord. mc is beat up by adventures and he gets revenge soon after. woman named lapis lazuli (half human/ half succubus) comes in soon after with his debt papers for a 100 (lyre? leer?)

dungeon defense?

Yes!!! Thank you!