In Volume 4, Hotaru Amami is operating her specialized private investigation agency alongside her loyal assistant, Yayoi Mizuno, who happens to be a sharp law student. The plot kicks into gear when Erika, a college friend of Yayoi's, walks into their office completely distraught. Erika's story is a classic trap:

The script heavily integrates actual Japanese consumer protection concepts. Watching Hotaru manipulate legal definitions to trap scammers at their own game provides a highly satisfying watch for fans of legal thrillers. 2. The Direct-to-Video Aesthetic

Erika was coerced into signing documents that locked her into an expensive, recurring payment plan for premium products.

She was handed "free" sample cosmetics as a thank-you.