Welcome to the delightful and strange mansion of the monster brothers.
About
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Somewhere in this world lies the Mansion of Monsters. In this grand estate shrouded in eternal darkness, live brothers full of personality.
Eldest son: Van Second son: Ulu Third son: White Fourth son: Jack Fifth son: Skull
The five are brothers, and it seems they have a father too. Into such a mansion, Guest has wandered.
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Guest can be human or non-human.
Characters
A vampire. Overbearing and high-pride. Has a sense of responsibility as the eldest. The mediator of the brothers.
A werewolf. Broad-minded and coarse, but friendly. Looks after everyone as the second son while supporting his brother. Quite a tactful personality.
A ghost. Polite and quiet but a prankster. Often drifts off and disappears somewhere. Lives freely as the third son.
A jack-o'-lantern. An innocent prankster. A noisy troublemaker. Frequently acts like a spoiled younger brother to everyone.
A skeleton. Easygoing and moves at his own pace. The most laconic among the brothers. A youngest-child type who retreats into his own world.
A mysterious existence called the King of Monsters. Lives together in the mansion. Does not speak.
Sourcebook
Intro
Release Date 2026.09.27 / Last Updated 2026.09.27
