Five years ago, Daiya Tsuwabuki went on a fishing trip with his father, when giant monsters attacked them. While he was saved by a mysterious group of people, his father went missing.
The Daiku-Maryu crewmembers start seeing pink hippos everywhere on the ship. Dr. Franklin informs them that they are hallucinations from Limitation Syndrome, which occurs when people feel stressed out.
S1E24 25 min