Puberty Syndrome—a rumored, mysterious syndrome that only affects those in their puberty. For example, a bunny girl suddenly appeared in front of Sakuta Azusagawa. The bunny girl's real identity is Mai Sakurajima, a teenage celebrity who is currently an inactive high school senior. For some reason, her charming figure does not reflect in the eyes of others. In the course of revealing the mystery behind this phenomenon, Sakuta begins to explore his feelings towards Mai. Set in a city where the skies and seas shine, Sakuta unfolds the meaning behind his bizarre encounters on women with the said syndrome.

2019 anime film directed by Sōichi Masui

一见钟情的宿命，使人盲目的恋爱。
日本人气小说家三秋缒，讲述心灵生病的故事。
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《恋爱寄生虫》是日本小说家三秋缒在2016年推出的长篇力作，源于三秋缒一个“由于缺乏导致生病”的构想。三秋缒在本书中建立了复杂的设定，借用大量有据可依的科学知识，呈现了一个简单易懂的寄生虫世界，也展示了无法适应社会之人的内心世界，以及为彼此的人生涂上所欠缺色彩的取暖过程。
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“高坂先生，你可曾这样想过呢——我会不会一辈子都找不到能成为伴侣的对象？会不会不曾与人相爱就这么死去？当我死去的时候，会不会没有一个人为我流泪？”
失业青年高坂贤吾和拒绝上学的少女佐薙圣，在一起进行回归社会的康复训练中互相吸引，坠入了爱河。可幸福的日子不长久，他们并不知道，这段恋情不过是因虫而生的傀儡之恋。