Haru, an energetic, honest, and sweet young girl, meets the popular grade schooler Yashima at a bowling rally, and she unintentionally develops a strange interest in him. He's very forward about wanting to date Haru. However, Haru is in love with her childhood friend, Yuusaku, who thinks of Haru like family and rejected her love confession before he left for America one year ago. But now Yuusaku is back! How will both boys respond to learning that they have competition for the role of most important man in Haru's life?

First volume includes a yomikiri, Let's Go Youth Heaven.