《爱情是什么》是由今泉力哉执导，岸井雪乃,成田凌,穗志萌香,江口德子,筒井真理子,片冈礼子,中岛步,若叶龙也,深川麻衣主演的爱情片。该电影于2018年在日本上映。山田光子（岸井雪乃 饰）是一名28岁的职场白领，在朋友的婚礼上，手足无措的她邂逅了名叫守（成田凌 饰）的男子，温柔风趣的守巧妙的化解了光子的尴尬和不适，一下子就俘获了光子的心。之后，守经常约光子出来吃饭玩耍，某一天，光子留宿在了守的家里，两人发生了关系。 光子开始越来越频繁的住在守家中，虽然没有告白，但是两人之间的相处就好像在交往一样，渐渐的，光子开始将自己的身份当成了守的女友。可是，对于守来说，光子只不过是一个召之即来挥之即去的消遣而已。为了守，光子甚至辞掉了工作，一心一意的想要和守结婚做家庭主妇，就在光子的算盘打得哗哗响的时候，守突然失联了。
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