Zach Loud, his brother Lincoln, their sisters Lori, Leni, Luna, Luan, Lynn, Lucy, Lola, Lana, Lisa, and Lily, and their parents Lynn Loud Sr. and Rita Loud are in the summer vacation in Japan to spend time with Touko Mishima, Rinko Mishima, Hajime Tachibana, Satoka Sagawa, and Misako Mishima, and Misako’s 5-year-old son Zach Mishima. While everyone are helping them in the shop, Zach still misses his big nightmare giantess twin sister Pai Pai when Hajime and Misako banished her years ago.