Also known as: チミドロスイッチ
English: Blood-Satined Switch
A song for MAYU (Vocaloid) by mothy/Akuno-P (悪ノP), with the PV illustrated by Kitano Tomotoshi. It was released as part of the initial promotional album for MAYU. Indicated to take place in the distant past by the album booklet for Nemesis no Juukou. Revealed to be the story of a patient with "HER" syndrome from the Second Period who was being treated by Levia Barisol.