Every family has its share of problems, be they big or small. Shino Tadokoro has the perfect high school life, full of romance and friendship. Her biggest problem is her shut-in brother Tamotsu. She stubbornly keeps his existence a secret, telling even her closest friends that she is an only child. Completely oblivious to Shino's concerns, Tamotsu suddenly declares that he is giving up the shut-in lifestyle. Is there still time? The curtain rises on a tale of family reconstruction!
After breaking up with her boyfriend Natsui on Christmas Eve, Shino Tadokoro has hit rock bottom. Meanwhile, her brother Tamotsu is on cloud nine after the college girl Erina stole his first kiss on that same Christmas Eve. The relationship between the siblings changes, and their dynamic shifts. Gradually, Tamotsu turns his attention to women, and Shino turns hers to her dream.... Catch the dramatic developments in today's most exciting family manga as it shows the hardship and joy of having a brother or sister!