https://www.bilibili.com/video/av30856633https://www.acfun.cn/v/ac30866034https://www.youtube.com/watch?v=2HGzySDQFhU ——————————背景图片: https://pixiv.net/artworks/70116129 (插画作者:mocha)
http://www.nicovideo.jp/watch/sm39245705