When Shiramine-sensei tagged along as support staff for the basketball club’s summer camp, she had no clue about the unwritten rule: female managers were expected to “handle” the players’ and coaches’ pent-up frustrations. Come to think of it, with no manager this year, the boys decided their teacher would do just fine—whether she liked it or not.

One night, the hormone-charged team cornered her. What followed was less of a “training session” and more of a brutal initiation rite, with Shiramine as the unwilling participant.