The Mistletoe (ミスルトウ) series is composed by Hitoshizuku-P × Yama△, with illustrations by Suzunosuke. The PVs are made by TSO and VAVA. Yamashita Seiichirou first appeared as the narrator in the prologue song, Mistletoe ~Tamashii no Yadorigi (Resting tree of the soul) and later in the novel's trailer.