来台湾工作并学习中文的日本女生橘子(加藤侑纪 饰)邂逅了台客摇滚乐团 “猴子电童”的主唱吴奇峰(周渝民 饰)。打算在台湾这段时间来段不考虑结果的恋爱的橘子和嫌恋爱麻烦的奇峰一拍即合。二人签下了合同约定这份恋爱的期限是90天。90天一满,就和平分手。不用担心未来,也不用担心分手时的不愉快,这段90天的恋爱起初让二人都十分开心和满意,但随着彼此对对方了解的加深,这份恋爱渐渐少了游戏的成分,多了份真心和付出。 随着时间的流逝,离期限越来越近,起初的愉快被苦涩所取代,而橘子也快回日本了。一直游戏人间的奇峰能否挽回橘子,给这段恋爱画下圆满的句点吗……A Japanese girl (Kato Youki) is on a three month visit in Taiwan after breaking up with her boyfriend to study Chinese at a language center. One day she has a brief affair with Wu and later he requests her to sign a contract to be his girlfriend for 90 days and she agrees. One of the condition of the contract is they must get separated after 90 days. However, after getting know each other quite well, both find that the relationship seems to be true love and both are unwilling to break the contract agreement as the dateline approaches. What is the outcome of their love story in the end?