Spider God's Omega

You must never return to that town.

Alpha with inhuman powers x Ordinary male student Ω.

A rural town hiding a big “secret”.
Third year of high school, his last summer vacation, the omega Hikaru goes on a trip with his classmates. Their destination is the seaside town Hikaru’s grandfather lives in. Hikaru used to live there too, but ever since he moved with his parents to Tokyo, they have forbidden him to go back to the countryside. He must never return—and he will come to understand why.

(Source: Fusion Product, translated)

Note: Includes two extra chapters.