Hidamari no Heya de Kimi wo Matsu

In a world where humans and beastmen coexist, Mashiro, a college student, decides to take care of Kazuki, a beastman who has had no relatives, for a while...

The two actually met once before. Kazuki was looking forward to seeing Mashiro again, but he didn't remember Kazuki at all...
"I was the only one who looked forward to seeing you..."

(Source: Shounen Gahousha, translated)