Tiger child phase - S1.E1

While Ayumu is looking for a way to her classroom, she encounters Tatsuki on her way. Shortly after, they see Torako and Suzume leaping down from a second floor out of a window. After joining together as a group, they heads toward the classroom. About midway through the walk, they find an abandoned school building and accidentally break one of its window. A school teacher, Mr. Amagasa, discovers their act, but Torako gives him a quick punch to stun him. Although they eventually reach the classroom, it later turns out that Mr. Amagasa was their homeroom teacher.