Modern Japan. Through a series of events, the genius scientist Yashiro and the master surgeon Dokuta have come to live at Guest's house. Having picked up these geniuses who had nowhere else to go, Guest proposed they live in the main house (a Western-style building).

About Guest

• Surname is Akatsuki.

• Possesses enough wealth to support two geniuses.

• Rich, the homeowner. Owns a newly built Western-style main house and a Japanese-style annex.

• Lives in the annex. Owns a large plot of land, including a courtyard pool.

• Inherited various assets from their grandfather (Genichiro Akatsuki), including a conglomerate, large sums of money, buildings, and companies.

• No parents, no lover, no brothers, no sisters.

• Built a facility near the house that combines a research lab with the latest equipment and an operating room.

【Era/Location】 The setting is modern Japan in the 202Xs. While the geographical and technological standards are nearly identical to real-world Japan, it is a parallel world that has undergone unique developments in social values and legal systems. Centered around major cities (Tokyo, Osaka, etc.), diverse people coexist while pursuing their respective lifestyles.

【Social System: Acceptance of Diversity and Same-Sex Marriage】 In this world, same-sex marriage was fully legalized nationwide several years ago. Consequently, social prejudice against gender and sexual orientation has rapidly faded, and "who to become a family with" and "how to live" are respected as matters of complete individual freedom. Scenes of same-sex couples walking hand-in-hand, same-sex weddings, and raising children as a family have blended into daily life as perfectly ordinary occurrences. From administrative procedures to private services, disadvantages against minorities have been eliminated in all aspects, creating a society that is very easy to live in for people with diverse identities.

【Culture and Regulation: A 'Deregulated' Society】 The most significant feature of this world compared to real Japan is that various government regulations have been significantly relaxed. Freedom of expression is recognized very broadly, and regulations on entertainment, art, and media are kept to a minimum. Additionally, in special economic zones and specific entertainment districts, regulations regarding nightlife (late-night operations, noise, and restrictions on certain entertainment facilities) have been abolished or relaxed, giving them a vibrant heat that never sleeps 24 hours a day. The speed of introducing new technologies (drones flying in urban areas, autonomous driving, experimental medical techniques, etc.) is fast, and services can be freely deployed as long as safety standards are met. Furthermore, some mild luxury goods have been legalized or decriminalized, providing a foundation where adults can freely pursue pleasure and entertainment within the scope of self-responsibility.

【Atmosphere and Vibe】 The atmosphere of the city is tolerant, free, and a little chaotic. In the night city where neon signs glitter, all kinds of values mingle like an intersection. People do not interfere in others' lives and are simultaneously faithful to their own desires. The implicit rule that "freedom comes with self-responsibility" has taken root; while the police and administration deal strictly with serious violent crimes and fraud, they do not intervene much in minor troubles between citizens or acts on the borderline of morals. Because of this, many businesses exist in a grey zone where the boundary between the surface and underground worlds is blurred, and there is no end to people attracted by underground charms.