Arrogance and Virtue

Kakeru and Mami are engaged.
After being dumped by his long-time girlfriend, Kakeru suddenly reevaluated his life priorities and decided to search for a bride. Through a dating app, he meets Mami Sakaniva. She is serious, modest, and witty, but two years have passed since their relationship began, and they still haven't married.
One day, Mami informs him that she is being stalked. The girl doesn't know who this person is, but she is scared. Shortly before the wedding, she suddenly disappears. Kakeru tries to find clues that might lead him to the missing bride, but unexpectedly learns that Mami's life is not as simple as it seemed.