Serika's younger cousin, Taichi, 6 years her junior had passed his university entrance exams and until he's found a place to rent, Serika will be looking after him.

Although he appears to be as pretty as girl and a sweet angel, he's grown into a sadist devil in the time they haven't seen each other!

He suddenly hugs her and kisses her ーーーSerika's self control is on the brink of collapsing before Taichi, who has grown into such a splendid man.

頭から足先まで、どっぷり俺にほれてもらう 俺のコトがほしいって…言えよ６歳年下のいとこ・泰一（たいち）が大学に合格し、一人暮らしの部屋が決まるまで、しばらく家で預かることになったＯＬの芹夏（せりか）。見た目が女の子みたいにキレイでかわいくて天使みたいな泰一だけど、しばらく会わない間に中身はドＳ悪魔に成長！　突然抱きしめられてキスされて―――すっかり男の顔になった泰一に、自制心が崩壊寸前の芹夏だけど…!?凶暴な天使が、私を翻弄中!?　危険いっぱい☆年の差いとこラブ