With All of My Heart Iko settles into Teru's middle school after being transferred, with the two now becoming classmates. Teru feels guilty for not being able to save her properly from the roller coaster accident, but Iko feels no resentment towards Shy for her injuries. Suddenly, a mysterious boy appears. The boy puts a dark ring on Iko's index finger which causes her to turn monstrous and lash out in rage...