Rin

mysterious girl who was trapped in an unidentified machine (refrigerator) that Miyuki excavated. She wakes up from cryo-sleep, but she has amnesia. Not wanting to be left alone, she is taken in by the protagonist and Miyuki.

Since her knowledge and sense of values are almost nonexistent, she innocently memorizes things one by one like a baby. She is innocent and full of curiosity. She also likes pranks.

She often plays pranks on the protagonist, which makes him angry, and she is spoiled by Miyuki.

She seems to have some connection to the origin of the breakdown...