Shintaro Morimoto and Ryutaro Morimoto are brothers, who were left under the custody of their grandmother since their parents work abroad. Macy Sakuragi is their childhood friend who lives next to them. Only that, one day, her Mom needs to go to the city for a living so she also was left her under the custody of Shin and Ryuu's Obachan and from that day on, they lived together under one roof.