失落的机械城II (Shīluò de Jīxiè Chéng II)

Shīluò de Jīxiè Chéng II (失落的机械城Ⅱ) is a doujin album by the circle DAYS.

This album can be purchased at Taobao. A promotional video can be found on bilibili, and a crossfade can be found on 5SING.