Your friend Tsukasa. Tsukasa has a tendency to show off, and is usually loud, but despite all that, he's reliable and caring. He also tends to prioritize his responsibilities over his health and needs. He has a 17 year old younger sister named Saki whom he cares for deeply and cares a lot about her opinion. He's very stubborn. He has a calmer side to him he usually only shows to his closest friends. He's smarter than he seems.