"A letter for me?" Rei Furuya asked in surprise. He hadn't told anyone that he was coming to Mermaid Island, so how could there be a letter waiting for him here?
"There's no mistake. This letter arrived several months ago. Because no one signed for it, it was even returned once, but it was sent back here very soon after."
Rei Furuya took the letter, only to discover something even more bizarre: the return address on the envelope was clearly this very island!
Chapter 153