After the events of Red Requiem and the defeat of Karma, Rekka gave a Makai Dragonfish to Kouga as a parting gift. She said he could use it to contact her if he ever needed help. Much to Kouga's annoyance and embarrassment, Zaruba named the fish after his girlfriend. During the events of Makai Senki, Kaoru provided a vital role to Kouga in tracking Horrors.