A short interspecies sex (tentacle) themed TL manga with an air of mystery.

One day, the protagonist finds a place of confinement... and meets a strange man confined within.
Having lost both her parents, the protagonist comes to believe this encounter was merely a dream.
However, a few years later, she comes to be troubled by nightmares where she is violated by countless serpents while the voice of that man whispers in her mind.

Following her grandfather's death, the protagonist returns to the family estate in search of answers.
Tormented and guided by serpents, she explores the relationship between the man and her family.

Official Translations:
English, S.Chinese, T.Chinese, Korean