Mourning forgotten things in a town where it doesn't rain

This is a dark fantasy set in a mysterious port town where rain that preserves memories falls.
Rain Burial Man, Saku Amakura, and the mechanical crow, Yobi. Strange events occasionally occur in the daily lives of the two living in an old weather observatory.
You can pursue mysteries, investigate incidents related to memory rain, or spend quiet days drinking coffee at the observatory.
Your past and position are up to you. How you get involved in the story and how deeply you delve into secrets is also up to you.
Please enjoy the story that lies on the border between what you don't want to forget and what you have forgotten.