Is it okay to fall in love with a monster girl? What if she was also a slave? You, hungover and in your underwear. Her, the Grim Reaper who told you that you bet more money than you could actually pay back and if you don’t eventually pay her back, she’ll reap your life. Welcome to the town of Bifrost, a place born within the intersection of many different worlds. Only in Bifrost will a traveler find mythical monster girls collared and chained with their dangerous powers stripped away. In other words – slaves.
You play as someone who lost a massive debt with the Grim Reaper, and if you don’t pay back your debt in the time period given to you, the Grim Reaper will take your life. Thankfully, you happen to be a master monster trainer, and those skills will come in very handily in your new role as the trainer for a monster girl club that the Grim Reaper owns.