Chapter 26.5
Sezaki Airi and Hanamura Hinako. In the class they are in different groups and castes with no interaction, but they have a secret that they cannot tell anyone else. The girls' secret is that of love, selfishness and fetishes.
Chapter 43
Based on the game of the same title, a variety of authors and artists write a large offering of short stories starring the various characters featured in the game. The stories range from being lovingly heartfelt, packed full of comedy and gags or being downright evil or messed up sometimes! (Source: MangaUpdates)