My Happy Marriage manga volume 3 features story by Akumi Agitogi and art by Rito Kohsaka.

Just as Miyo believes she may have found happiness at last, her jealous half-sister Kaya kidnaps her and locks her in a cellar. Kaya's eyes are red with rage as she declares her intention to dissolve Miyo's engagement to Kiyoka and replace Miyo as his fiancée herself! Will Kiyoka's supernatural abilities deliver her from Kaya's clutches in time?