Ryo Miyoboushi has lived a pretty relatively normal life with his older sister of one year, Miki, and his younger sister of two days, Yumi. Alongside his mother, Sayumi, they’ve pretty have held about as much of a normal sense of natural social stability as they believe that they have. That is, until the day when their Mother ended up re-marrying a mysterious first love who’s simply known as Tarak, of which Sayumi would simply rename him Ryuji. And just like that, Ryo’s life has slightly changed a bit when his Daughter, Tarumi, ends up being added to the family after Sayumi’s remarriage. And from then on, things start to a little bit better and unexpectedly crazy for him, and that’s merely the TIP on the insane iceberg here!