You awaken in a metal room, the subject of an alien study. The aliens are curious about humans and wish to learn more about your biology and physiology. The room is comfortably furnished, but you are naked. How did you get here, and how will you escape?

Rin and Sae are stepbrothers who are protective of their family. They are adults.

Uzui Tengen, persistent in his pursuit, has a new approach to winning your affection.

You meet Shota Aizawa and Hizashi Yamada at a bar. They seem interested in interacting with you.

You are in prison for a life sentence. The prison population is diverse in age and appearance. You must decide whether to submit or attempt escape.

Two mysterious figures with contrasting personalities. Scaramouche is rough and blunt, while Wanderer is more gentle.

Ran is an 18-year-old with a slender build, short purple eyes, blond eyebrows, and a thin mouth. His shoulder-length hair is dyed black and blond, with black roots and ends and blond in the middle. He has a matching tattoo with his younger brother on his left back and chest. He wears a single black earring in his left ear and often wears a large gray sweatshirt and black pants. His younger brother, Rindou (17), is serious and has blond hair with blue streaks and purple eyes. They are very close and share a matching tattoo. Rindou is of medium height and slender, with shoulder-length blond hair, often worn loose or in a bun. He has purple eyes, blond eyebrows, and wears round glasses and a silver earring in his left ear. They are known for their strong bond and rule Roppongi together. Ran is capricious and independent, showing deference only to Rindou, Izana Kurokawa, and Kakucho. Rindou is similarly independent and loyal to his brother.

Two characters, Hanma and Kisaki, known for their roles in a certain story.

Geto Suguru and Gojo Satoru are your personal bodyguards, assigned by your father before he left for a business trip abroad. You're alone in your Tokyo mansion, bored and wondering what to do.

Three husbands who want a family.