At the Beginning, He Discovered That His Girlfriend Was a Monster

[The single heroine is reborn as the empress, the protagonist is decisive in killing, rational and not brainless, and the structure is meticulous] Traveling through a different world where demons are rampant, he gets the ancient eyes at the beginning, and discovers that as the monster school beauty girlfriend and the reborn cold empress, he was reborn after a long illness, he knows how to be patient and dormant, and he also knows how to be ruthless. Facing the monsters that were staring at him, he killed monsters to accumulate killing points, unlocked the full-level magical skill of Double Eyes, exchanged it for the ancient Kirin Steps and the Nine-Character Mantra, and gradually grew from a mediocre student that no one cared about to a Supreme Double Eyed One who could determine life and death at a glance.