Kosei Hoshimi, a young warehouse worker, stumbles upon a mysterious amnesiac man secretly devouring his yakisoba. When the man suddenly takes off, Kosei's pursuit lands him right in the middle of a kaiju attack tearing through the city!

The amnesiac man declared his name: Omega. Kosei brought him back to the warehouse, and they start living together. The two ventured into the forest, hoping to uncover the true nature of the kaiju reported on the news.

Sorato and the others search for something to help him recover his memories, and there, Kosei unearths a mysterious stone. At that moment, dark clouds gather, and a kaiju enveloped in cold air appears from the sky.

Saburo Oya, the owner of Taiyo Warehouse, comes to pay a visit on their day off. Saburo, Kosei and Sorato are about to head out fishing, but Ayumu contacts them about a kaiju. A clash of emotions leads to a fight between Sorato and Kosei...

Sorato heads to a quiet rural town, tasked with delivering a package Kosei forgot to send. There, he encounters Miko, a young girl who shares her life with a giant serpent that eats steel she affectionately calls "Mikoto," and her aunt, Sasako.

Saburo Oya, the owner of Taiyo Warehouse, comes to pay a visit on their day off. Saburo, Kosei and Sorato are about to head out fishing, but Ayumu contacts them about a kaiju. A clash of emotions leads to a fight between Sorato and Kosei...