Personalized Kawaii Pencil Case 100 Days Smarter Youth Long Sleeve T-Shirt. Youth Long Sleeve T-Shirt - Black with funny kawaii cartoon pencil case with eyeglasses and school supplies (pencils scissors, ruler) says I'm 100 Days Smarter. Cute 100 Days of School gift. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)