Atri: My Dear Moments Episode 3 English Subbed

In the castle cities of Japan, an unexpected Sea rise came out and brought out many cities underwater. A huge human civilization faces a huge trouble because of this. There was a boy Who lost his family and even his mother in that incident, Ikaruga Natsuki. He came back to his city to see what lasted for him. His grandma was an oceanologist she died there. When he reached there he found that she left for him a huge debut and a ship. Where he found some kinda Map for a treasure in the deep ocean, he had a submarine that was his grandma. He went in search of that thin and finally after a long search he found a box. When he opened it a robot girl was sleeping in the coffin. She was looking exactly like humans. Anyone can mistake it for her look. She has some Human emotions. She promised to take care of him and become his left until he served the final will of his master.