Hehehe. Kouya friends names are Jun and Keisuke? Sure, it's just coincidence:)
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If you’re trying to imply that those names are ripped from Tennis Ace (or any other medium), I’m sorry, but I’m gonna have to point out your clear lack of knowledge on furry visual novels.
Jun and Keisuke (Kouya’s friends) have existed since the original Morenatsu, of which Kouya’s route was released in 2011. ;)