Otosareta Bishimai -Douka Sono Ko Dake wa Tasukete Kudasai | 堕とされた美姉妹～どうかその娘だけは助けてください～

After the death of parents, home is driven out by elder brother who is the only blood relationship, NEET Jinno Keiji of staying indoors that has been insulated. Though it is employed by the sympathy of older brother Shogo and the caretaker's living in work was introduced, the false name is compelled to hide the blood relative and it is despised, life in the moping lowest vicinity is pressed.

Still I worked hard at ground only by contact with girl student Ayase Kasumi which was pure every day, the reality pushes him down to the hell without mercy.

Kasumi, Faint love was held in older brother Shogo of Keiji. However, Shogo associates with elder sister Yuuka of Kasumi, it connects with the sexual relation. However, Shogo hides a low-life nature, it has turned an evil desire even to Kasumi. Keiji which sympathized with Kasumi which yearned for the older sister and put love feeling away, i try to keep her away from my older brother's desire somehow, Everything appears to backfire, eyes of contempt are finally turned from Kasumi.

It is cornered and Keiji in desperation over all decides revenge.

[An older brother and the woman and a younger sister is the same crime.]

The revenge play of a man who was the staying indoors NEET starts now.