Yume Yume Shinjuu

For someone who has no recollection of their childhood, Yuzuru's been having the same dream over and over again. One where he and another boy are playing in a small shrine. But he can never figure out who the other boy is. Then one day, his brother Ryosuke brings home a classmate of his, named Takumi. Within the memories that Yuzura can not remember, he realizes that Takumi was his childhood friend and first love. Takumi reveals that he is ecstatic that Yuzuru remembers. Happy to meet his first love again, Yuzuru once again becomes attracted to him, but...

(Source: Taiyou Tosho, translated)