Determined to prevent his cousin Reina from inheriting the family estate, Hikimori discovers that the maid Shieri is secretly involved with Reina's fiancé, Kouji. After learning that Kouji is merely using Shieri and plotting to murder the family patriarch for wealth, Hikimori convinces the heartbroken maid to betray him. By exposing Kouji's murderous intentions, Hikimori successfully drives his rivals away and secures the mansion, ultimately forging a genuine, if tumultuous, bond with Shieri.