Sohei Saikawa
(VA: Kasei Yasuyuki)

An associate professor of architecture at National Nagono University. He has gained the good will of Moe, but he doesn't particularly care about her. He is extremely intelligent, he has detached himself from the world, and he doesn't care at all about fashion. He loves coffee and cigarettes, but he hates watermelon, red beans, and soybean flower.

Moe Nishinosono
(VA: Tanezaki Atsumi)

The daughter of Sōhei's mentor, and a first year student in the architecture department of National Nagono University. She is a beautiful young woman from a high-class family. She has excellent insight, powers of observation, and calculation skills, but sometimes her thoughts jump to extreme conclusions. She loves the sound of car engines and mystery novels. She hates dried shiitake mushrooms, but because she believes they are good for anemia, she enduringly eats them every day.

Shiki Magata
(VA: Kido Ibuki)

A genius programmer who was accused of killing her parents when she was 14, but she was found innocent due to her psychological condition. She lives in isolation at a private research lab on a remote island.

Seiji Shindo
(VA: Shunsuke Sakuya)

the head of the Magata Research Institute. He is like an uncle-figure to Shiki. His hobby is to fly helicopters..

Yumiko Shindo
(VA: Sayaka Kobayashi)

Seiji's wife. She knew Shiki in her early childhood. Her speciality is making sweets.

Yukihiro Yamane
(VA: Tatsuhisa Suzuki)

the assistant head of the Magata Research Institute.

Tomihiki Yuminaga
(VA: Bin Sasaki)

the resident doctor at the Magata Research Institute.

Chikara Mizutani
(VA: Kentaro Itou)

an employee at the Magata Research Institute who is one of the few who has been at the institute since its establishment.

Ayako Shimada
(VA: Yoko Hikasa)

an employee at the Magata Research Institute. She is a programmer.

Toshiki Mochiduki
(VA: Hiroshi Shimozaki)

a security guard at the Magata Research Institute.

Satoshi Hasebe
(VA: Atsushi Imaruoka)

a security guard at the Magata Research Institute. His hobby is playing the marimba.

Miki Magata
(VA: Yuko Kaida)

Shiki's younger sister. She lives with a relative in America.

Momoko Kunieda
(VA: Houko Kuwashima)

Momoko Kunieda, an architecture student at National Nagono University. She assists Sōhei Saikawa with his accounts. Since she has an androgynous look and also has a very straightforward way of speaking, the other students are afraid of her.

Fukashi Hamanaka
(VA: Taishi Murata)

a student at National Nagono University who works in Sōhei's lab. He is in charge of planning the seminar trip, and finds himself camping on Himaga island, where the Magata Research Institute is located.

Setsuko Gido
(VA: Yui Horie)

a beautiful fair-skinned woman who is a magazine reporter. She has a close relationship with Sōhei, so she knows about his dislike of red beans and calls him "Sōhei-kun."

Suwano
(VA: Katsumi Cho)

a butler who has served the Nishinosono family for many years. He looks after Moe's everyday needs.