Mari Shiina

As class rep at Seizan Academy, Mari Shiina shares a classroom with Aoji and Akane, earning a reputation as the group's voice of reason. She sees right through Akane's obsessive tendencies and often steps in to restore order. Beneath her composed, courteous exterior, however, lies a secret infatuation with their chemistry teacher, Nadato Kusunoki. Despite maintaining a deliberately cool demeanor toward him in public, she has quietly mapped out an elaborate vision of their shared future—revealing a surprisingly tenacious and cunning side that few would suspect.