Last Round Arthurs, Vol. 2 (light novel)

There’s nothing in the world money can’t buy With the succession battle in full swing, it’s too dangerous to keep living in the dorms.
But have no fear: Rintarou has the genius idea to rent a place with Luna. Well, he must have forgotten who he was dealing with, because as soon as he hands her the reins-and his checkbook-money-hungry moocher Luna squanders his life savings on a colossal mansion! And just when their relationship couldn’t get any worse, they have a run-in with another duo vying for the throne: Emma Michelle and her Jack, Sir Lamorak. Turns out, Rintarou has history with Emma, who challenges Luna to a different kind of fight-where the prize is Rintarou!