Aozora no Sunda Iro wa

Aiming to become a sensei like his former sensei, Sugiura Sakae came to an elementary school as a contract teacher. Coincidently, his former sensei, Fukada Ryuuji, is currently teaching here. Ryuu-sensei is Sakae's idol, as well as his pillar of support. However, the "Ryuu-sensei" he'd once so admired is totally different now. Feeling bothered, Sakae slowly realizes that his feelings for sensei have transformed into love. But what about Ryuu-sensei?