Games like A Letter of Challenge

If you finished A Letter of Challenge, the closest matches are Swords & Souls: Neverseen, Re:Zero - Starting Life in Another World: The Prophecy of the Throne, Fault Milestone Two Side: Above, High School DxD and Dancing Blade Katteni Momotenshi!. All 6 share its adventure genre and are ranked by how closely their themes and modes overlap.