It is 50 pieces of images of けねけね (慧音 ☓ 慧音) [on April 30 a day of Shirasawa]
TAG: Images East Touhou Project 4 Day 30 50 Kei Shirasawa Two characters Imperishable night progressive
TAG: Images East Touhou Project 4 Day 30 50 Kei Shirasawa Two characters Imperishable night progressive