Rokka-chan no Koi Okawari!

Synopsis

I'm Kenta. Two months ago my master Rokka-chan started dating Ikumi. I love Rokka-chan, and I'm annoyed with Ikumi, but as long as she's happy, I'm fine with it. But lately, she's been sighing a lot. This is the story of Rokka-chan's love life as seen by Kenta, her shiba inu. (Source: Shogakukan, translated)