Mari Nishino is Takeru's cousin. She has a habit of always nagging at Takeru for various reasons, and often the two are at odd ends. Despite this, she appears to have fallen in love with him, and is very envious of his relationship with Hikari. She is still nice to Hikari and helps Takeru.

High school student Takeru Takemoto works part time as a (motor)bike courier. During one of his deliveries, he saw a mysterious light passing him and fell into a forest. What he had found was a beautiful girl coming out from a glowing cocoon, calling herself "Hikari." While Takeru was quite embarrassed because of Hikari's nudity, a strange monster suddenly showed up and immediately attacked the two. Both Takeru and Hikari demonstrated the power of their other selves before Takeru had a clue of what's going on.
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(Source: Anime News Network)

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