From Manga Updates
Imonoyama Taichirou falls in love at first sight with an Indian professor he meets at Oxford University. Soon after he returns to CLAMP School he finds that the person he saw has come to CLAMP School as a guest lecturer and he decides to try and win the man’s heart.
From Clamp Wiki:
This was one of the first stories published in Oneshot format CLAMP, 12 members back then. It was first published in the CLAMP BOOK dojinshi. Then, published directly in Volume format in 1987, and re-edited in 1990 by Kadokawa Shoten. The story focuses on a shonen-ai romance, and it all happens in CLAMP school.