I think the older brother has autism. That's why there are so many misunderstandings with Tsukasa. The confession to Haru was so out of place because he doesn't understand how to react to the situation and mistakes his feelings as love. (He's kinda mimicking his younger brother) Trust me it makes more sense when you read the brothers story. *Sorry for my bad english(⊙…⊙ )
I think the older brother has autism. That's why there are so many misunderstandings with Tsukasa. The confession to Haru was so out of place because he doesn't understand how to react to the situation and mistakes his feelings as love. (He's kinda mimicking his younger brother) Trust me it makes more sense when you read the brothers story. *Sorry for my bad english(⊙…⊙ )