Other titles :
姐さんカウントダウン!, 姐さんカウントダウン!~恋愛抗争編~, 姐さんカウントダウン！, 极道同学逼我嫁, Ane-san Countdown!, Anesan Coundown! - Renai Kousouhen, Anesan Countdown! - Ren'ai Kousouhen
Author(s) :Koda Momoko
School girl Riko Umekita's life is thrown upside down by scariest boy in her class, Saruwada-kun. His family is from a long line of Yakuza and is known not to mess with them. She is dragged home with him only to find her parents there after some circumstances... Saruwada-kun then asks her to marry him. What is going on?