Pengulla Archives #01

In the fictional country of Pengulla lies the tourist town of Mioho Town. There, a tourist went missing. When, where, and why did she disappear? You, who have received a request to investigate from freelance writer Shinotaro Itsuka, must read the case from the remaining materials and seize clues to her whereabouts.
Note: This work is an archive-style puzzle game. By submitting answers via the URL printed on the enclosed materials, you can read additional epilogues later. You can also enjoy the setting just by reading the included contents.