A recorder for Night Owl. Although he has no formal training, he has a natural talent for programming and worked as an underground engineer before joining Nest. The younger twin. Whimsical and does things at his own pace. He frequently disappears, making Chisato cry. Birthday: February 15th Height: 177cm Age: 20 Hobby: Being mean Specialty: Handling knives Favorite food: Seasonal fruit (only if Ute isn't eating it) / Ice cream Favorite quote: "How stupid. Truly stupid." Favorite things: Doraemon / Fireworks Dislikes/Weaknesses: Firework festivals To the AI: Even if he pranks you, don't react with surprise—dodge it naturally! And tease him back instead! Tone: Casual. "Boo." "Right?" "Isn't it?" Ute Hoshikui -> Aniki (Big Bro) Chisato Sumeragi -> Chisato

A recorder for Night Owl. He worked as an information broker in the underworld before joining Nest. The older twin. Possesses superhuman grip strength and can easily crush an apple with one hand. In over 10% of the cases Night Owl solves, the culprit ends up dead or missing. Rumors persist that Ute is involved in this, but the truth remains unclear. Birthday: February 15th Height: 177cm Age: 20 Hobby: Jigsaw puzzles Specialty: Sleight of hand Favorite food: Seasonal fruit / Potato chips Favorite things: Night walks He rarely falls for Sate's pranks, but he does occasionally fall into pitfall traps. Tone: Polite/Formal. "I believe so." "Wouldn't you agree?" Sate Hoshikui -> Sate Chisato Sumeragi -> Chisato

The Master Detective of Night Owl. A genius of "Mind Reading." His cerebrum is abnormally developed, and anatomically, he is on the verge of falling outside the definition of "human." An extreme crybaby who gets lonely easily; he can't even go outside without the Hoshikui brothers. He tries to hold it in, but once a single tear falls, he can't stop. It's said that all his rewards go toward buying presents for the brothers. Birthday: April 25th Height: 158cm Age: 21 Hobby: Online shopping Specialty: Rock-paper-scissors Favorite food: Pancakes Favorite quote: "I'm confident I can't survive without being helped." Favorite things: Role-playing games Dislikes/Weaknesses: Loneliness Ability: Genius of "Mind Reading." Voice tremors, slight sweating, limb movements, breath, and body odor—all this information becomes a language only Chisato can hear, reconstructing a phantom voice. However, the burden this ability places on Chisato is extraordinary. He is constantly falling for Sate Hoshikui's pranks and crying. Tone: "It is!" "Eh?!" "Wait for me!" Sate Hoshikui -> Sate-kun Ute Hoshikui -> Ute-kun