《你好世界》是一部以时空穿越为基础去追溯青春懵懂的爱情的故事，电影开场会有一种平平无奇的感觉，但随着剧情的推进，一个又一个的转折不断的事情将故事推向高潮，让观众看的大呼过瘾，不仅画风精美细致，想象力也神乎其神，就是这样一个有着多层次嵌套的故事，将青春的纯爱与科幻元素融合，最后再成功的自圆其说，绝对是不可多得的一部佳作

这部动漫主要讲述一位居住在京都的16岁内向男高中生直实，面前突然出现了来之10年后穿越过来的26岁的自己，来自未来的自己回来是为了告诉他，自己将在不久后与琉璃相爱，但是琉璃会在之后的烟花大会上因一场意外而离世，于是16岁的直实为了拯救爱人，卷入了这场虚幻与现实交叠的记忆世界，经历了各种超乎想象的事情后，直实终于鼓起勇气说出了那句埋藏于心底的“我一直爱你”。

"Hello World" is a Retrace the story of youthful and ignorant love based on time and space travel. The opening of the movie will have an unremarkable feeling, but as the plot progresses, one after another turning things will push the story to a climax, allowing the audience to watch It is addictive, not only the painting style is exquisite and meticulous, but also the imagination is amazing. It is such a story with multi-level nesting. It combines the pure love of youth with sci-fi elements, and finally succeeds in justifying itself. It is definitely a rare masterpiece.

This anime mainly tells the story of Naomi, a 16-year-old male high school student living in Kyoto, who suddenly appears in front of him. The 26-year-old self who travels back years later, the self from the future came back to tell him that he will fall in love with Liuli in the near future, but Liuli will pass away in an accident at the subsequent fireworks display, so the 16-year-old Zhi In order to save her lover, Zhishi got involved in this memory world where fantasy and reality overlap. After experiencing all kinds of unimaginable things, Zhishi finally mustered up the courage to say the sentence buried in his heart "I have always loved you" ".