Hera Space Adventure: Downright Survival

Once upon a time, a group of humans found an unknown planet they believed that the planet was origin place of humans. In this planet, lived a humans creator. They went to this planet with a plane, namely Agelada-05. When they were arrived to the unknown planet, something out of expectation was happening there. They thought the planet will be a quite friendly place for human living, but when for the first time they got their foot stepped down, they found a cave with so many thick liquid inside so...