You play as Kaito Soma, a 22-year-old cynical shut-in who falls asleep reading a forbidden occult manuscript. When he wakes up, he finds himself in Mumasekai — a decaying dimension ruled by succubi who have conquered all other demon races and reshaped reality into a realm of endless desire and despair.
In Mumasekai, men are a rare, hunted commodity. Most have been drained of their essence and turned into mindless “Lifeless Shells.” Kaito is marked as a “Primal Vessel” — a human with unusually potent soul energy, making him the most valuable prey in the realm. Mumasekai Lost In The World of Succubi
The goal: Survive, resist, or succumb. Find a way back to the human world — or embrace the darkness and become a lord of the succubi. You play as Kaito Soma , a 22-year-old
At the top are the pure-blooded Succubi, the daughters of Lilith. They are ancient, bored, and infinitely cruel. The primary antagonist, Queen Morvain, finds Kaito amusing. She does not want to kill him; she wants to play with him. Her power is absolute influence—she can rewrite a mortal’s memories with a kiss. At the top are the pure-blooded Succubi, the
Four main succubi factions, each offering different corruption paths:
| Faction | Theme | Reward | Consequence | |---------|-------|--------|--------------| | Carmilla’s Court | Vampiric dominance | Blood magic, immortality | Permanent sanity cap reduction | | Lilith’s Garden | Fertility cult | Summon minions, essence drain | Body mutation (non-human form) | | Morphean Brood | Dream manipulation | Enter others’ dreams, memory theft | Dissociative identity disorder (gameplay debuff) | | Vesper’s Void | Nihilistic pleasure | Pain-to-pleasure conversion, invincibility frames | Loss of unique dialogue options |