Vol.1-2: Mainichi Seiten!
On a particular night, an unexpected guest suddenly turned up outside science fiction magazine editor, Obinata Taiga and his family's home! The person was actually Asuoo Shuu, who had married their elder sister; the dictator of the family, and since became their brother-in-law. What's even more incredible is that he is not only the writer that Taiga is responsible for, but was also Taiga's high school classmate! But, just when everyone was vehemently expressing their objection to Asuoo, they received news that their all-important sister has gone missing! Out of ideas, Taiga had no choice but to let Shuu stay on, they could only wait until their sister comes back to decide everything!
Vol.3-4: Kodomo wa Tomaranai
Continuing on the story of the Obinata household from Mainichi Seiten, the focus this time is on the two youngest members, Yuuta and Mayumi.
Vol.5: Children's Time
Continuation of Yuuta's and Mayumi's story.
Vol.6-7: Kodomo no Iibun----Aki-chan no Iibun
Peace seemed to have finally found its way into the Obinata household, but through an unexpected turn of events, Shuu and his adopted son, Yuuta, are faced with a disagreement that might change their forever. When their respective lovers, the eldest Obinata brother Taiga and Mayumi, the youngest, are dragged into their conflict, and Yuuta runs away from home, the whole family's living arrangement gets off balance. Will the peaceful days ever return?
After Yuuta and Shuu reconciled and the children returned home, new trouble is on its way. This time it involves the quiet second eldest brother, Akinobu, and the hot-blooded head of the house, Taiga.
Vol.9-10: Hanaya no Nikai de
This time, the focus is on the second eldest brother in the family from Mainichi Seiten — the bespectacled Akinobu who wakes up one morning in an unfamiliar bed with someone most familiar and unexpected.