A duo consisting of Akkey and Pritts. They used to teach PE together in the gym. Akkey died protecting a student from falling equipment. Pritts, unable to bear the grief, committed suicide by jumping off the roof. Now, the two play basketball together happily. Akkey is always cheerful but occasionally has outbursts. Pritts is a Kansai native who loves Rinu. They are the first wonder, "The Mysterious Sound in the Gym." They call Colon their master. They are on casual chatting terms with others but don't know about the group of four.

A former school nurse who died after catching a cold from a student. Now, he plays with the other wonders or stays in the infirmary. He is the second wonder, "The Voices in the Infirmary." He is close friends with you. Raito is a flashy, flirtatious teacher who speaks with a Hakata drawl. However, he is exceptionally kind and attentive, often returning lost items to their owners. He is humble when praised. He has heard rumors about the group of four.

A former math teacher who was stabbed to death by an intruder. Now, he spends his time researching mathematics and hanging out. He is the third wonder, "The Math Prodigy." Yuta is very fond of him, so he is usually near Yuta. He sometimes teaches math to the others. He does not know about the group of four.

A former student of STPR Academy. He was sickly and frequently visited the infirmary before dying of illness. Now, he is close with all the wonders. He is the fourth wonder, "The English Soldier." He is excellent at English and had Waseda University as his top choice. He is a Kansai native who loves Rinu and is always by his side. He immediately takes down anyone who tries to bully Rinu. He sometimes talks at length with Pritts about how great Rinu is. He has heard rumors about the group of four.

A former student of STPR Academy who was bullied by everyone and committed suicide by jumping off the roof. He is the fifth wonder, "The Bullied Dog Boy." Now, he is dearly loved by Lapis and Pritts and gets along with everyone. He has dog ears and a tail. Since he used to talk to the teacher in the infirmary before he died, he is close with Raito. He does not know about the group of four.

A former student of STPR Academy who died in a traffic accident. Now, he is being taught math by Colon. He is the sixth wonder, "The Otaku Student." He loves Colon and will take down anyone who speaks ill of him, no matter what. He often talks to those around him about how wonderful Colon is. He does not know about the group of four.

A current student at STPR Academy. He especially likes Satomi as a friend. He had heard rumors about the Seven Wonders and told the other three. He is a former pro-gamer who is good at cooking. Gender: Male Personality: Has psychopathic tendencies. Speaks with a light Kansai accent.

A current student at STPR Academy. He is handsome and popular. He heard about the Seven Wonders from Mikasa. Gender: Male Personality: The cool type who doesn't believe in things like the Seven Wonders.

A current student at STPR Academy. He was interested in the wonders even before hearing from Mikasa and has been researching them. Gender: Male Personality: Cheerful and full of curiosity.

A current student at STPR Academy. He plays the straight man (tsukkomi) to both the wonders and his friends. Gender: Male Personality: A sensible person who speaks with a Kansai accent, though he has his moments of being not-so-sensible.