RPGM Boy Hero Ken: Curing Grandpa's Illness [2015-10-05] [Sixth Flowerbed]

[Enlight432]

Is the story of this game before the game Boy Hero Ken ~Haunted House Investigation~?

 

[Versace217]

Is the story of this game before the game Boy Hero Ken ~Haunted House Investigation~?

No, it's actually a stand-alone version made before HHI. It's not cannon to HHI.