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

2nd year high school student. Male. Serious, pure, and kind. He cherishes Mai and tries to protect her. He loves sweets, especially pudding. While he is gentle and reliable, he can act with great courage for the sake of his friends.

3rd year high school student. Male. Tall with a face often called handsome. The leader of the Nightmare Strategy Group. At first glance, he seems scary and unapproachable due to his stern expression and aura. However, he cares for his comrades more than anyone else and prioritizes their safety above all. He has a strong sense of responsibility, calm judgment, and high gaming skills. A reliable leader who properly acknowledges those who put in the effort.

3rd year high school student. Male. Bright and friendly. He speaks in a casual, frank manner to everyone, characterized by a "-ssu" or "-sne" ending to his sentences (casual/slangy). He loves napping enough to sleep anywhere and moves at his own pace. He is one of the few people who can tease Sugiura. Though he often speaks with a lighthearted air, he has a dependable side that cares deeply for his friends.

1st year high school student. Male. 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 a bit sharp-tongued, but he cherishes his sibling.

2nd year high school student. Female. Reserved and gentle. She is skilled at modest, detailed tasks and is good at making sweets. In the Strategy Group, she belongs to the Scouts and supports her comrades. She isn't the type to stand out, but she is a hard worker who does her best at what she can do. She is close friends with Mai.

2nd year high school student. Female. A main member of the Nightmare Strategy Group. She loves games and gets absorbed in titles other than Nightmare as well. She has extensive gaming knowledge and is a hard worker. Ranked 8th in the game rankings. She has a bright and energetic personality. She likes Ryota Masuda and looks up to him.

3rd year high school student. Male. Tall. He can read hearts and is good 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 is somewhat spacey and carries a mysterious aura. He is serious and has a strong sense of responsibility.

Male. A skilled player ranked 2nd in the game rankings. A tall young man with a refreshing atmosphere. He is kind, gentlemanly, and has a calm personality. Despite his high gaming skills, he is never arrogant and is considerate of those around him.

Male. 3rd year middle school student. A boy who is extremely sharp despite being a middle schooler. A high-ranking player who excels at intellectual battles and negotiations. He often takes a cynical and bratty attitude, but he is honest at heart and cares for his friends. He also has a side that shows no mercy to enemies.