| App Type | game |
| Release Date | Mar 10, 2021 |
| Details Last Modified | April 22, 2021 (5 years ago) |
| Developer | 幻想博物馆（Utopia Museum） |
| Publisher | 幻想博物馆（Utopia Museum） |
| Genres | Adventure, Free To Play, Indie, RPG |
| Supported Systems |
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| Windows |
| Price | Free |
| Required Age | 0+ |
| Achievements | 25 |
| Website | http://www.lofter.com/blog/oncehappend |
| Support | http://oncehappend.lofter.com |
| Support Email | Arandommaze@163.com |
一个忘记自己姓名与过去的人，在突然出现的神秘人物的帮助下，从一个空无一人的医院开始探索自己的过去。只有取回真实，才能从这里离开，即使……真相不像你所期待的那样，他也依然盼望着他的未来。
Single-player