少女、第四種接近遭遇。 (Shoujo, Dai Yon Shu Sekkin Souguu.)

Shoujo, Dai Yon Shu Sekkin Souguu. is a song sung by Teto Kasane, Ruko Yokune Female, Kakoi Nizimine, Hiyori Shirakane, and Yufu Sekka. It is a Niconico only song.