I Was Sold Dirt Cheap, But My Power Level Is Off the Charts Volume 3 (manga)

Magic Suit after Magic Suit fall on the battlefield. As Yuta cleaves his way through the fight, little does he know: soon, “she” will appear―but as friend or foe? With the beautiful gladiator Aryuna at his side, Yuta forms a mercenary band, the Iron Riders, and leads his loyal comrades into combat. Together, the hardy fighters cut down enemy after enemy, but unbeknownst to Yuta, a shock awaits him. The girl he always loved, Shirayuki, has been sent to fight against him. Completely unaware, the ill-fated pair begin a fateful battle.