While a dark Nemesis manipulates her younger sister Mea from the shadows, the emotionless, shifting assassin Golden Darkness returns to delve more into the secrets surrounding her new existence. This previously separated family, together with their newly discovered mother, Tearju, rapidly becomes the focus of everyone's attention. Princess Momo's Harem Plan, on the other hand, is on unstable footing, thanks to Rito's unwillingness to disclose to his longtime infatuation Haruna, who has developed feelings of her own.