Yuuta's sister Yuri finally entrusts her daughters to him as she and her husband Shingo leaves for a business trip-cum-honeymoon, with an instruction never to bring his girlfriend into the house. Coming home after seeing the couple off at the airport, Sora and Miu then introduce him to the house rules. Everything goes smoothly for the rest of the day well into bedtime until news came that the plane Yuri and Shingo were in crashed and they were among those considered missing. The family decides to break the siblings up, but Yuuta, remembering how his sister raised him herself after being orphaned, decides to take them all with him in his apartment.

Yuuta takes Sora, Miu, and Hina out of their house before his relatives would come to take them. While eating lunch at a karaoke box, Kouichi attends to the three, as one of Yuuta's relatives calls, asking him to bring the girls back. Only then that he realizes the full scope of the challenge he has gotten into. Despite this, Yuuta carries on, and brings the three girls to his apartment. Meanwhile, Sora and Miu is trying their best to adjust to living in Yuuta's apartment while getting a grip on things and accept them as they are, amidst Hina's asking for her mother and father. Sora, meanwhile, is glad that she and her sisters are not going to be separated.

Yuuta awakens to find Sora hugging him. She starts screaming when she finally awakens. Yuuta leaves the three girls in his apartment with an instruction never to leave home and never answering the door. Yuuta was later ambushed by Raika and the rest of the Sightseeing Club for him not visiting them in awhile. Meanwhile, the girls had to do something, given the rather huge bill for their breakfast. They tidy the room, head to the laundry shop, and shop for vegetables for dinner, though Hina starts writing on the wall with permanent pens and making dinner being a disaster. Though Yuuta, coming home late, gets upset with what happened, his being upset is replaced by happiness, because he understands the thought of all of it counts.

Yuuta has invited the members of his club to dinner at his home to meet his nieces. Shuntarou is overwhelmed by Miu and Hina, while Raika is smitten with Sora. Life with Yuuta and the girls have become routine, and what to do about the upcoming school term was the next family problem. But a visit from the Landlord has changed everything.

Yuuta is so focused and happy about being a good father, a visitor with some information snaps him back to reality. He's offered a choice that could change everybodies lives.

The end of the month is coming and Yuuta has thought he made his final decision, but after Hina’s outburst about her mama and papa, the decision has become even harder.