Invaders Of Rokujouma Collector's Edition Volume 04

"Valentine's Day is right around the corner. Amid all the fun, however, Ruth receives a strange message from her parents back home in Forthorthe... and they want her to get married! While trying to get home, Koutarou and Clan encounter a young girl named Kii. Worried that she might have seen Clan's spaceship, they dig a little deeper into her story. What's a six-year-old kid doing alone in the mountains, anyway? Contains volumes 9-11."