- Azusa Kinose (木ノ瀬 梓 Kinose Azusa) Voiced by: Jun Fukuyama
- Azusa represents the Sagittarius. Although he is a newcomer to the archery club, he has met Tsukiko before and inspired her to become better at it. He is cocky and confident of himself; while he declares himself as a natural genius, he is in fact insecure of his abilities as he can't put his heart into anything. Azusa often flirts with Tsukiko and his actions annoy Ryunosuke a lot. He is a first year.
- Tsubasa Amaha (天羽 翼 Amaha Tsubasa) Voiced by: Kenichi Suzumura
- Tsubasa represents the Aquarius. He the treasurer of the student council. He often lights up the mood in the student council. However, he is emotionally unstable. At a very young age he was abandoned by his parents who got divorced. He was taken in by his grandparents on his mother's side. When Tsubasa was young, he spent a lot of time with his grandfather and they often made inventions together. Even now, Tsubasa still likes to invent things. His grandfather's dying wish made Tsubasa promise to take care of his grandmother. His grandmother sent Tsubasa away to school, and ever since Tsubasa likes to be alone. He thinks that being alone is better than being with people because he is afraid of losing things that are important to him. He is a first year.
- Kazuki Shiranui (不知火 一樹 Shiranui Kazuki) Voiced by: Yuichi Nakamura
- Kazuki represents the Aries. He is the president of the student council. He is gifted with the power of foresight, although this ability does not allow him to see everything. He blames himself for the death of his parents because of his lack of understanding his power. Because of this, he hates his power. As a child, he was often involved in fights to prove his own strength, but one day he had met Tsukiko, who told him that only people who think they are weak try and show their strength through brute force. He had become friends with her, and Kanata and Suzuya as well. He is a third year (apparently he repeated a year, together with Shirogane)
- Suzuya Tohzuki (東月 錫也 Tōzuki Suzuya) Voiced by: Daisuke Ono
- Suzuya represents the Cancer. Calm and friendly, he was friends with Tsukiko and Kanata since childhood and often watches out for them like an older brother. He is very good at cooking and often uses the school's kitchen to prepare food for his friends. Suzuya is also in love with Tsukiko, but because he knows that Kanata also loves her, he held back. Beneath his warm exterior, Suzuya has a dark side and worries about Tsukiko constantly. He is a second year.
- Kanata Nanami (七海 哉太 Nanami Kanata) Voiced by: Tomokazu Sugita
- Kanata represents the Pisces. Brash and impulsive, he has been friends with Tsukiko since childhood and has developed feelings for her. He does not get along very well with Yoh. Kanata suffers from a terminal illness that leaves him in a lethargic state, which is why he often skips classes and faints without reason. However, he refuses to seek medical help and often gets into school fights that worsen his health to protect Tsukiko. He is a second year.
- Ryunosuke Miyaji (宮地 龍之介 Miyaji Ryūnosuke) Voiced by: Hiroshi Kamiya
- Ryunosuke represents the Scorpio. He is the sub-captain of the archery club. He appears to be serious and calm, but hides a penchant for sweets. Ryunosuke has kept an eye out for Tsukiko ever since he first saw her. He is a second year.
- Yoh Tomoe (土萌 羊 Tomoe Yō) Voiced by: Hikaru Midorikawa
- Yoh represents the Capricorn. His French name is Henri Samuel Jean Aimée. Likewise, he is half-French and was often teased for that as a kid. He met Tsukiko when he was young, and because she was the only person who didn't make fun of him for being half-French, he fell in love with her and asked his father to let him transfer to Seigatsu Academy in order to pursue her. Initially disdainful to everyone except Tsukiko, eventually, he learns the importance of having friends. His father hopes to work in America to develop a special astronomy project. He is a second year.
- Homare Kanakubo (金久保 誉 Kanakubo Homare) Voiced by: Soichiro Hoshi
- Homare represents the Taurus. He is the captain of the archery club. He is openly friendly and often settles arguments between Ryunosuke and Azusa, but is prone to feel pressured for the success of the archery club. He is a third year. His best friends are Shiranui Kazuki and Shirogane Oushirou from the same year.
- Hayato Aozora (青空 颯斗 Aozora Hayato) Voiced by: Daisuke Hirakawa
- Hayato represents the Virgo. He is the vice president of the student council. He comes from a well-known family of pianists, but lacks self-confidence and feels pressured to be up to par with his family's talent. In the end he decided to leave his house and stays in the school dorm. He is a second year.
- Kotarou Hoshizuki (星月 琥太郎 Hoshizuki Kotarō) Voiced by: Akira Ishida
- Kotarou represents the Libra. He is the school nurse who had ambitions to become a doctor. Iku's sister, Yui, had feelings for him, but after her death Kotarou blamed himself for not being able to save her. His father is the chairman of the academy, but after his father's retirement, the position was given to Kotarou's sister, Koharu. However, he ended up obtaining the position due to Koharu's wish to work overseas.
- Iku Mizushima (水嶋 郁 Mizushima Iku) Voiced by: Kouji Yusa
- Iku represents the Gemini. He is currently a student teacher and is friends with the school nurse, Kotarou, since they were children. Iku and his twin sister Yui were both born with poor health, and Yui died while they were in high school. He was formerly the lead singer of a band the heroine liked, but destroyed his voice while overworking himself due to the pain of his sister's death. His band members turned out to be using him for money and promptly dismissed him when he could no longer sing. Iku lost trust in everyone until a girl, Tsukiko, helped him gain it back.
- Naoshi Haruki (陽日 直獅 Haruki Naoshi) Voiced by: Daisuke Kishio
- Naoshi represents the Leo. He is Tsukiko's homeroom teacher and the advisor for the archery club. He is energetic and enjoys the "youth" part of high school since he spent high school mostly studying, and because of that, a lot of students can't take him seriously and often play pranks on him. Naoshi's best friend, Hiroki, got him to enjoy high school, but Hiroki was hit by a car saving the girl he liked.
- Shiki Kagurazaka (神楽坂 四季 Kagurazaka Shiki) Voiced by: Mamoru Miyano
