As a die-hard fan of Nanami Rua, the elf Isabella Nolan could never tolerate Amagi Mir's despicableness - she took advantage of Kaito Domoto's amnesia to sneak in and crush Rua's sincerity with every provocation. In order to seek justice for Luya, Isabella used elf magic to travel into the world of "Mermaid Melody 2", using the pseudonym "Momoka Mitarai", and customized a "pseudo-redemption" for Amagi Mir.
During the day, she is a gentle and considerate "best friend" who listens to Mil's grievances, but deliberately gives "suggestions" that intensify the conflicts between her and Luya, Boing, and Lina, making her more and more paranoid in the eyes of everyone; at night, she transforms into an elf and sneaks into Mil's dreams, using illusions to recreate her loneliness and unwillingness.
Unexpectedly, another time traveler Qi Shengmin (pseudonym Kudo Shengzi) broke in with a mysterious white shell necklace and tarot cards. She also hates Mi'er, but prefers to use a more direct method - exposing Mi'er's little thoughts in public, making her embarrassed when showing off, and becoming the most powerful helper in Isabella's "pseudo-redemption" plan.
The two reached a temporary cooperation, one used gentleness to weave the web, the other used sharpness to pierce it, step by step pushing Amagi Mir to the edge of hope and despair. When Mil thought that he could finally gain recognition with the help of his "best friend", Isabella tore off all pretenses in front of Luya and others, completely shattering the truth of "redemption" and Mil's world - this battle based on "love"
