![2girls animal_ears binayu black_hair blonde_hair breasts bunny_ears business_suit formal large_breasts long_hair multiple_girls necktie red_eyes reisen_(touhou_bougetsushou) short_hair skirt skirt_suit suit touhou watatsuki_no_toyohime yellow_eyes rating:s score:5 post #333559](/cdn_image/preview/2e/0d/2e0dffbeb5cd28df35c08f4bb2d132d9.jpg)
Not to be confused with Reisen Udongein Inaba, Reisen is the Watatsuki sisters' pet in Silent Sinner in Blue, a comic book spinoff series based on Touhou.
Named after Reisen Udongein Inaba. Sometimes referred to by fans as "Reisen II" (レイセン2号) to distinguish her from the original, but may also use the unofficial romanised "Rei'sen" with the use of an apostrophe.