Last Round Arthurs v01 (2020)

English translation of the Japanese manga Last Round Arthurs (ラストラウンド・アーサーズ).
For as long as he can remember, Rintarou Magami has been able to do everything perfectly-but life as a genius is boring. That's why when he hears about a battle to determine King Arthur's successor, he decides to have a little fun and join forces with the weakest candidate, Luna Artur. The only problem: Luna already sold her Excalibur for cash! As the nighttime battles of swords and sorcery intensify, will Rintarou regret backing such an utter scumbag?