If you're looking for anime similar to Southern Bird and Northern Bird, you might like these titles.
Atsushi Arisawa is a boy in love. As a child he had a crush on Masami – so after discovering that his lost love works as a teacher at Jougaoka High School, Atsushi quickly finds a way to attend. However, once there Atsushi discovers that Masami is nowhere to be found! In his place is Masayoshi, a brash and attractive man who is nothing like the boy of Atsushi’s dreams. What Atsushi doesn’t know is that Masayoshi is actually Masami’s brother, and that his beloved Masami happens to have a crush of his own...
The official music video for Uchuu no Kisetsu, by Lanndo.