Escape Room Summer Time

Today is the day I'm going home, so my grandfather used to bury something in the mountains to remember his summer vacation, so he said he'd go look for it together, but suddenly he was able to do something, so he went looking for it together. I can't do it anymore. It's boring to do nothing until the time to return (15:00), so I decided to look for it alone. However, it seems that my grandfather will return tomorrow morning, so it's a pity that I can't give it directly to my grandfather even if he finds something buried, but I'm excited because he seems to be searching for treasure.
I hope I can find it ...
[Providing material]
OtoLogic : https://otologic.jp
Music-Note.jp: http://www.music-note.jp/
Pocket Sound: https://pocket-se.info/