Working man Yajima Shigeru always finds himself falling for straight guys and has repeated one-night stand to flee from his failing love. This time, his heartbreaking decision led him to kiss his current love who happens to be a married junior from his work place! The train conductor happened to see the drunken Yajima planting a kiss on his junior. After being denied by his junior, he's picked up by the conductor, Mita Yuusuke, who claims that that he fell in love at first sight?!