Gravitation (2000)

S1E11 Secret Day

Yuki's health has deteriorated due to the numerous treatments he's undergone in the hospital, and Shuichi carries much of the responsibility for this. Concerned for Yuki's wellbeing, the staff advises Shuichi to keep his distance for a time. When Shuichi learns of this separation, he is deeply shaken. That night, he visits Yuki in the hospital and talks to him about his feelings, unaware that Yuki can actually hear him. In the end, Yuki realizes what Shuichi has been saying while he pretended to be asleep.