She is a beautiful, young, and popular idol. Like almost everyone else, she is caught in the line of fire during Izumi's killing spree in Shinjuku. She develops a crush on Kurono after seeing him in action during her first night as a participant in the game. Surprisingly enough, she proves to be a formidable opponent against the Aliens.
She uses her points to resurrect Tae because she wants Kurono to be happy. It is not until Kurono chooses to be free that she confesses her love to him. After Kurono departs from the game, she is appointed the new team leader of Gantz. After Kurono is revived, Reika confesses her feelings to him, but Kurono, having rekindled his relationship with Tae, rebuffs her. Distraught over Kurono's choice, Reika suffers an apparent mental break, and resolves to earn 100 points to revive a new Kurono for herself. She succeeds in reviving a second Kurono who exists concurrently with the copy brought back straight from the Oni mission end transfer. The second Kurono now lives with Reika and she seems to quit her job to be with him, even going as far as to mention changing her name to "Reika Kurono." However, she died during the last mission when she wanted to protect the second Kurono.