(例大祭2) [ドウガネブイブイ (あぶりだしざくろ)] 姉妹で結婚って法律上OKだよね？ (東方Project)

(Reitaisai 2) [Douganebuibui (Aburidashi Zakuro)] Shimai de Kekkontte Houritsujou OK dayone? | Is it legal for sisters to marry? (Touhou Project)