Last Round Arthurs, Vol. 1 (light novel)

Local high school prodigyRintaro Magami's daily life is pretty boring, though not for lack of things todo. He's just...done everything already. In order to kill some time, hedeliberately teams up with Luna, the most good-for-nothing girl around, andenters a competition to decide the next successor of the legendary King Arthur.But there's just one problem... Luna pawned off the holy swordExcalibur!