Yuuki just lives a peaceful life. But one day, his classmate says to him, "Congratulations! You now have the rights to love someone." He is told about the W.L.O. (World Love Organization). According to his classmate, the purpose of the organization is to help people achieve their love to deal with a decreasing birth rate. He also says, "Use your natural born strong semen to save the world." His partner is Aina, his neighbor and childhood friend. With the support of Hotaru and Ina, members of W.L.O., his project starts. Arisa, a girl from another organization called NOA (Nothing or All) and his underclassman Yuriko also get involved in the project. A grand love project now starts...