Omi Sensei No Binetsu

omi tsukasa, who still holds a flame for his close friend and first love, su-chan, becomes a new teacher assigned to his old school. there he spots su-chan's doppelganger, a student named sugimoto. upon finding out that sugimoto is su-chan's nephew, omi starts having an interest in him, much to the annoyance of his target of interest.