Inu to Tsubame

Inu to Tsubame summary:

Kaede is still mourning the loss of his brother when he is suddenly reunited with his childhood friend, Noro. As they get closer, Kaede shares his suspicion that he may have caused his brother’s death. After hearing this, Noro recommends animal therapy and lets Kaede use him as a pet dog. But one day, the dog suddenly kisses his owner…?