Junta Shiraishi blends into the background so much that even his classmates fail to spot him. His goal is to make the most of his high school years, but that pesky invisibility gets in the way...until Nagisa Kubo notices him! Kubo's playful teasing kicks Shiraishi out of his comfort zone and begins a friendship--or maybe something more?

Summer vacation is looking up for Shiraishi when he and his friends make plans to hang out. Of course, they all have to pass their end-of-term exams first... Then, Shiraishi gets an invitation from Kubo's sister to work at a Kubo family beach shack. Sand, sea, and swimsuits, oh my!