Recorder and Randsell (2012)
Original title: リコーダーとランドセル
Recorder and Randsell is a 2012 Japanese-language animation series. It stars Ryotaro Okiayu, Rie Kugimiya and Aya Uchida.
On the surface it seems as if Atsushi is an adult, but really he's just an elementary student! However, he is paired with a second-year high school student Atsumi, whose height is just the opposite of his. These two together create an unusual relationship and will undoubtedly instigate some comedic antics in this slice of life comedy!
Where to watch Recorder and Randsell
Stream: Crunchyroll, Crunchyroll Amazon Channel