Play Koinu to Issho 2 Online

Konami released Koinu to Issho 2 for the Game Boy Advance in 2004, a time when handhelds were full of quirky, small-scale pet sims. It was never a big name outside Japan, but it fit right in with the GBA's library of charming, low-key titles that didn't demand your full attention.

You control a puppy through a series of mini-games and training exercises, like fetching a ball, navigating simple obstacle courses, or learning new tricks through timed button inputs. The main goal is to raise your dog's skills and bond through repetition and care, like brushing its fur or giving treats after a success. The pacing is deliberately slow and forgiving; there's no real failure state, just gradual improvement (or very cute pratfalls). It feels like having a tiny, low-maintenance companion living in your pocket, one that never needs to be fed for real but still makes you smile when it finally gets a trick right.