放課後は恋のレッスンを/君は最高のダイヤモンド

Mirabelle has fulfilled her childhood dream to marry her first love, an elite teacher named Arthur. But for some reason, her smart and handsome husband refuses to lay a finger on his innocent bride. What secrets from Arthur's past stand in the way of their love? A historical romance double feature set in a beautiful and prestigious school! (Source: Ohzora Shuppan, translated)