User blog comment:BearCute/Yume and Berry Parfait/@comment-28962677-20170301233736/@comment-3487190-20170302043221

I kinda doubt that this silhouette being Koharu. If Koharu is able to go back to Japan now, she would enter the S4 competition instead of transfering to a rival school.

Yeah, but there' still 50% chance it's her since silhouettes usually mean "surprise", so let's just see how the story goes.