吉是东京的一名英语老师，37岁，单身。闲暇时间，他喜欢玩拼字，在优兔上看喜剧，唯一的朋友就是一只宠物龟。单调而安静的生活使他彻底麻木，以至忘记了自己的寂寞。而在一个单身妈妈朋友向他表达了出乎他意料的倾慕之心后，一切开始发生变化。

Yoshi is an ESL teacher in Tokyo. 37 years old. Single. He spends his free time putting together jigsaw puzzles and watching comedy on Youtube. A pet turtle is his only friend. His repetitive and quite life has numbed him to the point where he's forgotten his loneliness. Things begin to change when a single-mom friend shows Yoshi affection he wasn't prepared to receive.