大きい1年生と 小さな2年生 (ookii ichinensei to chiisana ninensei, A Big 1st Year and a Little 2nd Year, 1970) is a children's book by FURUTA Taruhi (古田足日, 1927-2014). The title characters are in their first and second years of elementary school (小学校, shougakkou), so probably six and seven years old respectively. The book too is clearly aimed at relatively young readers.
