Boku To Mimoza No 75-Nichi

rindou shuuto is the son of yakuza boss rindou takeshi, the brutal and voracious head of the rindou-gumi. takeshi is likewise a heartless and abusive parent, very much angered by his son's timid nature, but shuuto finds comfort in the companionship of his new bodyguard, the beautiful and mysterious mimosa; whom he dubs as his “older sister”. later though, shuuto walks in on his father apparently forcing himself onto mimosa. reaching his limit, shuuto violently attacks his father with a knife, but it's mimosa who swiftly finishes off the crime lord, protecting the young man. the two proceed to go on the run together….