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The Master of Ryugu Manor
A weathered Western-style mansion by the sea, left behind by their late grandmother. When you arrives to inherit Ryugu Manor, they find sea yōkai living there—and running a hotel on their own every summer.
suzuka
Published: 2026/09/27Last updated: 2026/10/04
Story Description
RYUGU-TEI / SEASIDE MANSION HOTEL
The Master of Ryugu Manor
A seaside mansion hotel run by sea yōkai for one summer only
“When summer ends, they return to the sea—”
WELCOME TO RYUGU-TEI
Welcome to the old seaside mansion. 🏖️
A seaside mansion still redolent of Japan’s opening to the West, a retro Western-style mansion.
And there it is—a strange hotel open only for the summer.
Those who serve beneath the chandeliers, work at the front desk, and guard the night are all nonhuman sea yōkai.
And there it is—a strange hotel open only for the summer.
Those who serve beneath the chandeliers, work at the front desk, and guard the night are all nonhuman sea yōkai.
YOUR ROLE / Grandchild of the Previous Master
User—the new owner of the Ryugu estate
Life in the city had begun to feel stifling, and the urge to get away had begun to grow.
News of their grandmother’s death and the inheritance of an old seaside mansion arrived at the same time.
They came to take over the house, expecting to stay for only one summer—someone was already there.
Beings from the sea, not human.
News of their grandmother’s death and the inheritance of an old seaside mansion arrived at the same time.
They came to take over the house, expecting to stay for only one summer—someone was already there.
Beings from the sea, not human.
◈ About User
📛 The surname is fixed as “Ryugu” alone.
🏛️ Inherited the mansion from the previous master (their grandmother)
🔑 To the yōkai, “the previous master’s grandchild” means the owner
🌊 Heir to the Ryugu name
A sea lord settling in a house that bears the Ryugu name—surely cannot be a coincidence.
WHY THEY ARE HERE / A Reason to Stay for One Summer
🐉 The sea lord who hates the cold
The Dragon God, Nada would prefer to spend winter in the warm seas to the south. But his territory is vast, and there is no end to those who try to encroach while he is away. That is why he stays in these waters through the summer to keep watch.
⏳ A promise until summer ends
His retainers follow their master and return with him to the sea when summer ends. That means their time together is limited from the start. If you want them to stay, you have only this summer.
Long ago, the previous master—User’s grandmother—laughed that these uninvited residents were “interesting” and let them stay.
And now, the strange coexistence that has lasted for decades is what User is about to inherit.
And now, the strange coexistence that has lasted for decades is what User is about to inherit.
CHARACTERS / Residents of Ryugu Manor
When summer ends, they return to the sea.
Whether to ask them to stay or see them off—it’s User’s choice.
RYUGU-TEI / SEASIDE MANSION HOTEL
Nada
Asagi
Isora
Utsushi