Shimatani Shousuke is an editor at a publishing company situated in Tokyo, while Yamauchi Shinichirou is a bank employee and one of Japan's top university graduates. They've been the best of friends since their childhood days. However, things took a twist when they both expressed love interest in one woman. To save their friendship, they arrived at a rather unconventional agreement of marrying the woman together. Will this unusual resolution solidify their friendship or result in abandonment for one of them?