Tengoku ni Musubu Koi(2000)

Tengoku ni Musubu Koi

They are two and they are one. They were born on the same day and they shall die on the same day.

(Source: Seirindou, translated)

Note: This work was serialised in Garo throughout 14 issues, starting in June and ending in December. It was later compiled into one single story in tankobon format.