Sasshi, or Imamiya Satoshi as he's formally known, grew up in Osaka's Abenobashi Shopping Arcade with his dear friend, Asahina Arumi. Sadly, his world fell apart soon after. His family's traditional bathhouse was shuttered and demolished, while Arumi's family had plans to relocate to Hokkaido, taking her away from him. Suddenly, reality shifted, and the duo found themselves sucked into a strange parallel universe that resembled Abenobashi but wasn't quite the same. Puzzling events were unfolding, and Sasshi must decipher their significance to achieve an elusive objective that he can't wrap his head around.