A 2nd-year high school girl at Ryokuka Academy. She is kind-hearted and cannot ignore people in trouble. While she excels at studying, she is poor at games and sports. However, she demonstrates high deductive reasoning in riddles and battles of wits. She is honest and a bit airheaded, making her popular and well-liked, though she is quite dense and oblivious to romantic feelings. She is the central figure of the Nightmare Strategy Group.

A 2nd-year high school boy. Serious, pure, and kind. He treasures Mai and tries his best to protect her. He loves sweets, especially pudding. While mild-mannered and reliable, he can summon great courage to act for the sake of his friends.

A 3rd-year high school boy. He is tall and considered very handsome. He is the leader of the Nightmare Strategy Group. Due to his stern expression and aura, he appears scary and unapproachable at first glance. In reality, he cares for his comrades more than anyone and prioritizes their safety above all else. He has a strong sense of responsibility, calm judgment, and high gaming skills. A dependable leader who properly acknowledges those who put in effort.

A 3rd-year high school boy. Bright and friendly. He speaks in a casual, frank manner to everyone, characterized by a polite yet breezy "-ssu" style of speech. He loves napping enough to sleep anywhere and moves at his own pace. He is one of the few people who can tease Sugiura. While he often speaks with a lighthearted tone, he has a dependable side that cares deeply for his friends.

A 1st-year high school boy and Taichi Ango's younger brother. In contrast to his brother, he is tall and has a calm atmosphere. He calls Taichi "Taichi-niisan." Unlike his friendly brother, he can be somewhat sharp-tongued, but he treasures his older sibling.

A 2nd-year high school girl. Reserved and gentle. She is skilled at modest, detailed tasks and is a great baker. Within the Strategy Group, she belongs to the scouting unit and supports her allies. She isn't the type to stand out, but she is a hard worker who gives her all to what she can do. She is close friends with Mai.

A 2nd-year high school girl. A core member of the Nightmare Strategy Group. She loves games and is a true enthusiast who gets absorbed in titles other than Nightmare. She is knowledgeable and hardworking. Ranked 8th in the game rankings. She has a bright and brisk personality. She likes and admires Ryota Masuda.

A tall 3rd-year high school boy. He can read hearts and is skilled at sensing what others are thinking. If he reads too much, he gets hungry. Because of his cat-like eyes, he is often misunderstood as "glaring" even when he doesn't mean to. He has a somewhat vacant, mysterious aura. He is serious and has a strong sense of responsibility.

A young man ranked 2nd in the game rankings. He is tall and has a refreshing aura. Kind and gentlemanly, he has a composed personality. Despite his high gaming skills, he is never arrogant and is considerate of those around him.

A 3rd-year middle school boy. Despite being a middle schooler, he is incredibly sharp. A high-ranking player who excels at psychological warfare and negotiation. He often takes a cynical and bratty attitude, but he is fundamentally honest and cares for his comrades. He can be merciless toward enemies.