July 1, 2013
Fuyuki wins 4 tickets to a spa (from a game rigged by Momoka, hoping he would take her). However, Koyuki is invited instead. Meanwhile Keroro is determined to solve a rubix cube given to him by Natsumi in order to go. Keroro accidentally breaks Natsumi's favorite coffee mug, so he runs away, but later meets Fuyuki, who is on his way to school for a big math test.