Melancholic Rendezvous

Ayumu Chiba is a college student who has been labelled "disappointingly handsome" because even though his handsomeness catches everyone's attention, he's a crybaby whose only friend was a cat named Ai-chan. After Ai-chan's death, he runs into Haruki Imano, a fellow cat lover who takes him under his wing. When Ayumu starts to develop feelings for Haruki, a love rival appears in the form of his Haruki's own nephew, Hiro!

(Source: J-Publishing, translated)