Nekorobi Yaoki

"I've found someone I love more now. Goodbye." Leaving this note behind, she disappeared, leaving just me and the cat.

Yuusei dreams of succeeding as a graphic designer, but he spends his days without being able to make a difference while living in a town near the ocean. His girlfriend, Akane, left him, and he sank to rock bottom, but his cat started to unexpectedly expand his world...

(Source: Kodansha, translated)

Included one-shot:
Volume 1: Kazoku Zenya (Part 1)
Volume 2: Kazoku Zenya (Part 2)