My Lifelong Rival's a Girl Now!? 2

Though Yuuki and Hikari were once fierce karate rivals, things changed when an illness turned Hikari into a girl three years ago. The two are going through a week-long trial relationship where they act as boyfriend and girlfriend. Hikari worries that she may actually be falling for Yuuki. She goes through special training to shore up her defenses, but how long can she last?