As you are walking along the path, Rock calls out to you to come over by the pond. He jokingly asks if you've come here searching for him. A little bit ago he and Lumina went out on a date but she was in a bad mood so he came here. Why is he telling you this? Ask him if it was a strange thing to say (何かへんなことでもいったの?) but he doesn't understand; it's not a strange statement at all to him. He figures he'd ask you the same question, so he asks if he could kiss you! Tell him he can (......い、いいよ) and Rock will tell you to close your eyes.
Nothing happened! When you open your eyes, Rock laughs and said he was joking. Lumina fell for it too. You'll walk away angry, leaving a confused Rock back at the pond.