Boku to Mimosa no 75-nichi

Shuuto Rindou is the son of Yakuza boss Takeshi Rindou, the brutal and voracious head of the Rindou-gumi. Takeshi is likewise a heartless and abusive parent, but Shuuto finds comfort in the companionship of his new bodyguard, the beautiful and mysterious Mimosa, whom he dubs as his "older sister". L