The Disastrous Life of Saiki K. — Chronicles of the Grandparents' Travels + Returning the Favor, Toritsuka's Ascetic Fasting + A Misunderstanding Between Opposite Sex Friends + A Big Scoop!
Kusuo's grandparents are visiting but get delayed on the way to the house. Luckily, or perhaps unluckily, his friends soon find them and try to help.