In een andere wereld heeft een steeds groter wordende Zee van Sneeuw het planeetoppervlak overspoeld. De mensen worstelen om te overleven terwijl ze rond de routes van een enorme baanboom leven, waarvan de takken zich hoog boven de grond in het hemelmembraan verspreiden. Er komt verandering in deze stervende wereld nadat Kaina, een jongen uit het hemel membraan, een meisje van de oppervlakte tegenkomt dat Ririha heet.
| Directing | 安藤裕章 | Series Director |
| Writing | 村井さだゆき | Series Composition |
| Sound | KOHTA YAMAMOTO | Original Music Composer |
| Sound | 馬瀬みさき | Original Music Composer |
| Sound | 澤野弘之 | Main Title Theme Composer |
| Visual Effects | Ryouhei Fukushi | Character Designer |
| Visual Effects | 小谷杏子 | Character Designer |
| Art | 片塰満則 | Conceptual Design |
| Art | 田中直哉 | Production Design |
| Art | Kazuma Teshigahara | Production Design |
| Crew | Takuma Ishibashi | CG Supervisor |
| Crew | Masaki Taga | CG Supervisor |
| Art | 久保季美子 | Art Direction |
| Visual Effects | 松本吉勝 | 3D Supervisor |
| Visual Effects | Hironori Nochi | Color Designer |
| Visual Effects | Kazumasa Isawa | Layout Supervisor |
| Sound | 土屋雅紀 | Sound Director |
| Production | Akitoshi Mori | Producer |
| Production | Yuko Hamamoto | Producer |
| Sound | 西名武 | Music Producer |
| Sound | Yoshiyuki Asakawa | Sound Mixer |
| Sound | 倉橋裕宗 | Sound Effects |
| Editing | Kazunari Hoshino | Editor |
| Production | Yasushi Kuwata | Executive Producer |
| Production | 末平アサ | Executive Producer |
| Production | William Ireton | Executive Producer |
| Production | Mitsuharu Moriya | Executive Producer |
| Production | 高扬帆 | Executive Producer |
| Production | Daisuke Kawakami | Executive Producer |
| Production | Shuzo John Shiota | Executive Producer |
| Production | Ge Yangqian | Executive Producer |
| Writing | 弐瓶勉 | Comic Book |
| Visual Effects | Kazumasa Isawa | Animation Supervisor |
| Visual Effects | Daiki Seo | Modelling Supervisor |
| Visual Effects | Shuhei Kitano | Modelling Supervisor |
| Lighting | Mai Kouno | Rigging Supervisor |
| Visual Effects | Miyuki Kamiya | Animation Supervisor |
| Visual Effects | Lim Yew Chin | Animation Director |
| Visual Effects | Taichi Sudou | Effects Supervisor |
| Visual Effects | Hiroyuki Matsushima | Compositing Supervisor |
| Visual Effects | Choon Ho Tee | Compositing Supervisor |
