spoiler warning
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After going through Jun's route, and accidentally stumbling upon some obscure diseases after jumping through a huge rabbit hole, it hit me. Could it be that Jun has a disease called Williams-Beuren syndrome? The symptoms for this disease include having bubbly personalities, full cheeks, varying degrees of mental proficiency, and most notably heart defects and an affinity for music. Reading those symptoms, I couldn't help but wonder if some of Jun's scenes (like the part where he never gets more than 50% on a test, him clutching his chest after strenuous activity, and for being good at music) are because of that syndrome. Thoughts?