While hiding big feelings in their small breasts... You can't always continue to support the person you love, and... continuing to support doesn't always bring happiness. Nana and Hikari are lovers who attend the same girls' school, and they are both in the track and field club, and they are training hard for the regional tournament. The relationship between the two of them turns into a stronger bond after Nana confides her worries to Hikari, and gradually deepens... This is a story of the small love between two small-breasted girls, in 5 parts.