Isao Kako was a troubled youth with many problems. He acted as an errand boy for a group of bullies to avoid being the subject of their abuse, and his parents would let him get away with just about anything, much to his older sister's chagrin. Kako's only "friend" was Kirie who also went to his school. Kako would constantly boss Kirie around since it made him feel less like a loser and Kirie would take this abuse without complaint. Kako in fact made Kirie accompany him to the nature school for this very reason.