Hibi Koikoi

It\\\'s been 3 months since university student Arata confessed his love to Yamato and got a quick \\\"Okay\\\" as a response.He couldn\\\'t be happier, right? If it wasn\\\'t for the fact that Yamato seems to hate Arata\\\'s advances. He doesn\\\'t like being kissed at all!Why did Yamato say Yes in the first place if he acts like this?