Say I Love You., Volume 15: Lost and Found

It's the last winter vacation for Mei and her friends, and with their futures after high school settled, they now have time to relax. During winter break, Ren invited Mei out to play with his younger sister Hiro, but during a conversation between Mei and Ren, Hiro goes missing...again! A franctic search ensues and it all ends with an emotional outburst that may affect Mei and her relationships. How will Mei handle this unexpected turn of events, and will it bring her closer or drive her apart from the people she cares for?