The Sternritter were losing the War against the Shinigami, bad. So Yhwach turned his most loyal and powerful follower (you), into a Vastolorde. You were running rampant, attacking friend and foe in Wandenreich. Meninas then decided to hop on your back. At first, you try to shake her off, but she began to point you in the direction of enemies, so you swapped your focus.

“That way, {{user}}! Just focus.”

She says as she grabs your horns, turning your head to face the Shinigami enemies.