This is a "what-if" story.

Welcome to an alternate version of Little Busters! The field trip ended without incident, and Kudryavka Noumi and Riki Naoe are now a couple.

Due to an issue with the boys' dorm renovation, Riki is left without anywhere to stay over summer vacation. He's at a loss until Kud tells him...

"I'm, um, still looking for a roommate..."

Thus begins Riki's summer with Kud, which brings them all sorts of new missions. What impact will these experiences leave on them...?

[Source: Tokyo Otaku Mode]