Koneko gave her first kiss to Issei after he protected her and Kuroka from the grim reapers and accepting her proposal in Volume 24, making her his sixth bride.
Rias is the woman who reincarnated Issei after Raynare killed him and the woman he loves.
In Volume 5, Koneko started to develop feelings of love for him after Issei helped her overcome her fears of using Senjutsu after Issei told her that he was not afraid of her and would stop her if she ever went out of control, giving Koneko the courage to accept her true self.
In her "Shirone Mode" that she used for the first time in Volume 16, Koneko can make herself grow older, and her attire consists of a short white kimono and a light blue skirt. Her bust size grows significantly larger when in this mode, making her look more similar to her sister Kuroka.Jun 29, 2018
Following the events of Volume 2, Rias falls madly in love with Issei and attempts to keep him away from the other girls who may have affections for him. This includes, but is not limited to, Akeno, Asia, Xenovia, Koneko, Irina, and Ravel.