佐原 リナ

A quite looking girl around the same age as Reiji, however on the inside she is quite perverted. Whenever she gets stressed out, she comforts herself in her room, but “eventually, wanting to see the real thing, she remembers a neighborhood park she had heard about and goes there to masturbate. Eventually, she encounters the protagonist and enjoys the sex she has always wanted to have to her heart's content. [From official site]