I have some medicine that may restore her memories, but they may not be in their original form however.
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Artist's commentary
[Doujin reprinting] Lost Reimu
This is a work distributed at the 2015 Reitaisai.
今年頒布した作品と同じ世界だと考えると、紫さんとか面白いかなと思いまして公開します。(同じ世界とは言っていない)
I have also published an afterword on Pixiv FanBOX
https://www.pixiv.net/fanbox/creator/160897/post/175252
Original work:Tamuhi-san(user/2039139)
Collaboration: lilish-san(user/48905), 村上4時さん(user/309850), Moizumi-san(user/1353882)