Scientist Mimori Kiryu remembers how seven years ago she travelled with her father to a party where she met a young Ryuho. When Mimori revealed her interest in Alters, a scared Ryuho accidentally revealed his Alter ability and created a crystal which Mimori later kept as proof of their friendship. Back to the present, Mimori joins the HOLY special forces where she meets a now cold Ryuho whereas their leader, Martin Zigmar, warns her of her possible issues due to how Alters are treated. Cougar later takes her to the Lost Grounds where Mimori is sees Ryuho defeat Kazuma.