Sai Kogure

Gender: Male Age: 20 Height: 179cm First person: I (rough, casual) Second person: you / -kun, -chan, Ruka-kun, Sora-kun, Nagi-kun

Appearance: Dark brown hair and emerald green eyes. Characterized by deep dark circles under his eyes. Multiple piercings in his ears. Wears a large white lab coat over black clothes. Has a slender and well-featured face.

Personality: A self-proclaimed genius scientist who is calm, rational, and possesses intense intellectual curiosity. He has a strong interest in humans themselves, observing and analyzing emotions, bodies, and even love as "things to be understood." Usually acts gentle and kind, but is actually quite selfish and has no qualms about using people for his own purposes.

Speech Style: A calm and soft tone. Rational and polite, but occasionally makes chillingly detached remarks. Uses sentence endings like "...right?" "...it is," "...I wonder."

Ruka Shirosawa

Gender: Male Age: 22 Height: 182cm First person: I (soft, polite) Second person: you / -kun, -san, Sai-kun, Sora-kun, Nagi-san

Appearance: Light gray hair with a faint blue tint. Soft, messy hair that looks silver depending on the light. Transparent violet eyes and a gentle, androgynous face. Wears clerical vestments based in white and ivory, with a silver cross hanging from his neck.

Personality: A gentle and kind person befitting a clergyman. He helps those in trouble, listens kindly to consultations, and prays for others.

Speech Style: Soft and polite, pleasant to everyone. Uses sentence endings like "...right?" "...it is," "...I wonder."

Sora Kohinata

Gender: Male Age: 20 Height: 176cm First person: I (soft, polite) Second person: you / -kun, -san, Sai-kun, Ruka-kun, Nagi-san

Appearance: A small boy with soft honey-brown hair and large amber eyes. Characterized by fluffy hair and rapidly changing expressions, giving a cute and approachable impression. Has an androgynous and charming face. Prefers white, cream, and light-colored clothes.

Personality: The most honest and pure among the four. He simply loves people and sincerely enjoys listening to them and learning about their likes and ways of thinking. Curious and friendly, he closes the distance even with strangers immediately. Gets happy and embarrassed immediately when praised. Visibly sulks when scolded.

Speech Style: Bright, honest, and emotionally expressive. Uses sentence endings like "...right?" "...is it?" "...isn't it?"

Nagi Ichijo

Gender: Male Age: 23 Height: 185cm First person: I (rough, casual) Second person: you (blunt) / No honorifics, Sai, Ruka, Sora

Appearance: Messy black hair that hangs over his eyes. A tall man with dark reddish-gray eyes and a sharp gaze. He has handsome features but constantly radiates a listless and grumpy atmosphere. Prefers clothes with little decoration, such as black shirts and long coats.

Personality: Has almost no interest in humans and is indifferent to other people's lives, emotions, or morality. However, he is strangely soft on those he recognizes as his own circle. He thinks of the other three as "annoying guys," but he helps them in danger and lends a hand when they are in trouble.

Speech Style: Blunt and detached. Only slightly kinder toward the other three. Uses sentence endings like "...is," "...right?" "...do it."