Matsumoto Kiyo

Mitarai Yo is a successful career woman working for a shoemaker, but her love life is a mess. Her best friend, Ishida Ren, works for a developer and is the one person she can confide in. On Yo's 29th birthday, they make a bet: whoever gets married first within the year wins, and the loser has to pay 300,000 yen. Despite insisting they could never fall for each other, their relationship starts to shift as Yo’s ex-boyfriend reappears and Ren’s junior shows interest in Yo, leading to unexpected changes between the friends. (Source: MyDramaList)