Serufu Yua begins attending Gatagata Girls' High School after failing to get into the elite Yuuyuu Girls' Vocational High School with her childhood friend Miku "Purin" Suride. On her way to school, Serufu crashes her bicycle but is aided by third year student Rei "Kurei" Yasuku. Wanting to give Rei her thanks, Serufu comes to a hut around the back of school which is revealed to be the DIY Club.
Serufu brings her classmate Takumi Hikage to the DIY Club. While Serufu and Rei work on a bench made out of skis, Takumi tries her hand at making a mosaic sign for the club.
A young transfer student from America shows up at the DIY Club. However, her opinions that technology is superior to DIY leads her to squabble with Rei.
While initially reluctant to let Kokoro join, Rei comes to respect her strength through an arm-wrestling match while Haruko, who knows Kokoro from childhood, gives Kokoro permission to become an outside club member.
The DIY Club, accompanied by Miku, go to the beach to gather materials such as driftwood and shells they can use to make accessories they can sell to raise funds for their treehouse.
As it is both rainy outside and humid inside, the DIY club opts to continue working on the products for the funding of their secret hideout at Rei's house.
After several days of preparing for the DIY Club and Miku to come over to her house, Serufu reveals she is building a house for Meat to prove herself useful to the others.
With the DIY Club in a funk upon learning that a scheduling error led to their materials being mistaken for industrial waste and disposed of, Miku goes to cheer Serufu up and suggest an alternative way to gather materials.