Kimi Wa Haru Ni Me Wo Samasu

from lovesick alley ito and chiharu, though seven years apart, share a very deep friendship in which ito has an unrequited love for chiharu. in a turn of events, chiharu is afflicted with a terminal illness and is put into an induced comatose state in hopes that a cure will be developed while he is sleeping. after seven years, chiharu wakes up, and finds that ito is now the same age as him, and that his then-classmate has become his homeroom teacher.