Kudou Sobaku

Note: 地雷女（Jirai-onna) lit. "Land Mine Woman". A 'landmine' is a girl/woman who wears cute clothes/makeup but in truth, is nothing but trouble. "Women with over 2 two ribbons on their body are 20,000,000% a 'Landmine-Girl'." -Kiryu Coco

Fuyuki is a beautiful and cool gal! But there's a secret side of her that she only shows in front of her husband...?

For the sake of finding clues about his younger twin brother who suddenly went missing, the protagonist changed his identity and infiltrated the academy his brother was attending. However, what clearly came to light there was a surprising truth! His brother had multiple fiancées...? (Source: Ganma)