Reo

Born and raised on Mars, naturally he was curious on life on other celestial planes. With intense begging towards his father, finally he was allowed to visit Earth, as it has the safest living conditions compared to the other planets. On Earth, he posed as a young human boy around the age of 7(closest age to his actual body).

One day, during one of his visits, he went to play in the mountains without permission of his father. The weather grew worse, and Reo was lost in the thick forest. One wrong step, and he fell of the cliff. Chihaya, who was a boy living near the mountains heard a loud noise and went to see what happened. There, he saw a fainted Reo and panicked. Chihaya's family took care of Reo for a few days before his father finally found him, his heart almost leaping out of his chest. During those few days though, Reo felt as if he finally had a friend. He was interested in the story Chihaya told him, the fantasies made him want to stay on Earth longer, as much as he can't. During the last night, Chihaya brought him stargazing, where Reo could see his home shining among many more in the sky. He felt as if time had stopped and wanted to spend more time with Chihaya.

Ten years since then, Reo came back to Earth just to meet Chihaya. He transferred into Chihaya's school, with the help of the human caretaker he's living with. Chihaya, having no memories of him, was weirded out by Reo's familiar attitude. That didn't break Reo's enthusiasm, and he was determined to make Chihaya remember.