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Reika is a mysterious person seems to know about the connection between Midori and Yuusuke. She seems to be intent on keeping the two apart, trying to put Yuusuke and Futaba together instead. Reika's motives are explained near the end of the series. Her given name in Japanese means "lovely flower". Unlike the other characters, Reika was not in the H-game of Green Green. She was created as a new character for the television series. Source: Wikipedia After Midori gives Yusuke the energy she was using to stay in the past to save his life, Reika is forced to take a weakened Midori back to the future in order to save her life too.

But just before they leave though the time gate, she does comment that she is happy and amazed that despite her interference, and against all odds, Midori was able to defy fate's decree by being with Yusuke even for a brief time.