在公关公司上班的OL春美谈起了社内恋爱，男友是同家公司的同事永田。就在春美接受永田的求婚后不久，她被上司指派执行一项企画案，这也是她首度在工作上独挑大梁。因为工作和婚礼重叠而蜡烛两头烧的春美，这天她与厂商开完会后在回家的路上，赫然遇到了三年前解除婚约的前未婚夫日夏。当年日夏告诉春美另外有了喜欢的人于是和春美分手。这场与前未婚夫突如其来的偶遇，春美的心是否会因此出现动摇呢……

Harumi works as a planner at an event planning company. She had just been proposed to Nagata, who works for the same company, and she was enthusiastic about her first solo job. However, Harumi accidentally reunites with her ex-girlfriend's fiancé, a talented planner, Yu Hinatsu.