Reaper of the Thirteenth Step precedes "Welcome to the Mirror World" and follows "The Lunar Festival". In this story, Aya Souma steps on the thirteenth step as counting. After Aya spends two months outrunning Izanami in his game of tag, the final day is the day of the school marathon, where Izanami will be running and chasing her the entire time. Aya runs as fast as she can...

Characters Edit

  • Aya Souma
  • Izanami
  • Michiru Sakurada (cameo)
  • Sakunoshin (mentioned)
  • Higanbana (cameo)
  • Black Tea Gentleman (cameo)
  • Nurse (cameo)