 There are three additional sub episodes in the Windows version of "Futari no Elder".The primary setting is at a private all-girls school named Seio Girls' Academy, also called Seio Jogakuin Christian Education, which was founded in 1886 by Mizuho's ancestor.Seio was originally named , which was used in original Windows version, the drama CD of the visual novel, and for the "Caramel Box Yarukibako" fan disc.