Last Round Arthurs, Vol. 3 (light novel)

You dont know what you have until its gone. Luna is on the verge of death when a new King viciously attacks her using their Jack, Sir Tristan. Meanwhile, Rintarou joins forces with someone who used to be in the Dame du Lac, ready to go up against another version of himself. Neither Luna nor Rintarou are ready to give up their respective fightsespecially if it means they have a chance to get back whats precious to them.