For the first time falling in love, but that person is your best friend's boyfriend! Rena, Rio, Daichi, and Hajime are four close friends. Rio and Hajime are currently a couple, while Daichi and Rena are still single. However, the relationship among the four is quite complicated. Hajime loves his girlfriend Rio, but Rio has feelings for Daichi, Daichi likes Rena, and Rena secretly loves Hajime. This complicating relationship continues until one day... This time, all four decide to go camping. Here, Rio gathers her courage to confess to Daichi but is rejected by him. Rena and Hajime also find out about this. Rena decides to bravely confront her feelings. She honestly tells Hajime that she loves him. But like Daichi, Hajime still loves Rio, so he turns her down. However, due to the situation earlier, Hajime is not in a good mood. That night, while showering, Rena comes in; she wants to help him ease his sadness by performing oral sex on him. A few days later, Rio joins a camping course with her class, and Daichi also participates. In disappointment, he met Rena again, and this time he no longer rejected her. They both shared a short period of happiness together. Nevertheless, he still refused her feelings. When Rena accepted Daichi's confession, Hajime realized he also had feelings for her, and how much he liked her. Riding his bike beautifully to where Rena and Daichi were camping, he discovered that Daichi was waiting outside. It turned out that Daichi also realized that Rena did not have feelings for him. He willingly let go, so she could be with the person she loved. Rio also honestly told Hajime about his feelings for Daichi. And then, those who truly loved each other ended up together, a happy ending for those who dare to stand up for their love...