Perfect World, Volume 7 (Perfect World #30-34)

Tsugumi and Itsuki find themselves working together on a barrier-free house for Kaede and Keigo. The morning before the topping out ceremony, a huge earthquake hits... and no one can get hold of Itsuki. As Nagasawa and Koreda make their way to Matsumoto from Tokyo, Keigo and Tsugumi head for Itsuki's house on foot... and they don't have a second to spare!