Hitsuji no Kawa wo Kita Kemono (Chara Comics)

[Machine Translation] If I get any closer, I'm in trouble. This guy is my sister's fiancee - a very handsome guy who works for a prestigious company and has money and potential. And they got engaged within three months of meeting! Daichi, the younger brother of the university student, is inwardly astonished by his sister's boyfriend, Igawa. Why does he have to be with his sister, who looks good on the outside but is crass and selfish at home, and this man, who is so flawless that he is, on the contrary, a bit suspicious? At first, Daichi is wary of her because he can't shake the feeling of uneasiness. However, he gradually becomes fascinated by the adult man who gives him advice on job hunting and life...?

これ以上、近づいたらマズい。この人は、姉貴の婚約者だ──一流企業勤めで、金も将来性もある超イケメン──。しかも出会って三ヶ月で婚約した!?　姉が連れてきた恋人の井川に、内心驚愕する大学生の弟・大地。外面はいいけど、家ではガサツで我儘な姉と、欠点がなさすぎて逆に胡散臭いこの人がなぜ…!? 初めは違和感が拭えず警戒していた大地。けれど、就活や人生相談に乗ってくれる大人の男に、次第に心を奪われていき…!?