It was a life-changing incident. Kinaho lived by herself until the day her boyfriend, Akito, suddenly brought home two young boys. The brothers were Akito’s relatives and had just lost their parents in a tragic accident. A very serious 2nd-year middle schooler called Touma, his 5-year-old brother Haruhi, and Akito start their life together in Kinaho’s house. A series of confusing days give way to the beginning of their new relationship.