Souta, a high school student, has been hopelessly crushing on his childhood friend Chika for years. Afraid of ruining their close bond, he's kept his feelings hidden. But when Souta suspects Chika might be interested getting a girlfriend, his patience runs out, and he decides to finally confess. Just as he's about to blurt it out, Chika stumbles upon a rather...unexpected object left behind by Souta's dad and they end up using it together!