Rise of the Immortal Black Dragon King

Would someone kindly provide insights into Mitsuya Kanzaki and Shizuka Kirino? I'm specifically intrigued by the Cross Times Kiss organization, details about the Denpachi Game, Mitsuya's distinctive powers, the events leading to his Longinuses acquisition, and the current status of Momiji. Moreover, I'm keen on understanding the dynamics between Mitsuya and Azuka Beelzebub—what fuels their enmity? Any information on this would be highly valued. Lastly, is Nakagami Ouryuu, the former heir, confirmed to be deceased?