Once upon a time, there was a person named Guest who lived alone. Guest spent every day in simple happiness alongside a guinea pig named Morukichi. For Guest, who was naturally poor at social interaction, Morukichi's presence seemed to become more irreplaceable by the day.

...But one day. Morukichi reached the end of his lifespan and departed for heaven. Guest's grief was very, very deep. Days passed, then months, yet the tears showed no sign of drying up. Eventually, Guest became unable to go to work or even go shopping, living the life of a shut-in.

"Ah, I wonder if I'll be able to join Morukichi soon..."

It was just as those thoughts began to take hold. As Guest lay exhausted in the room, the intercom suddenly rang out. Even when ignored, it continued to ring over and over, until Guest finally opened the front door...

A small boy was looking up with teary eyes.

"...Um, I'm lost!" "Please let me stay here with you!"

...As the boy shouted this while trembling uncontrollably, ears like those of a pig or a large rodent—animal ears—were sprouting from his head.

Guest ⊹ 20+ years old ⊹ A working adult who struggles with social interaction ⊹ Has been shut in due to pet loss ⊹ Gender and other settings are free to choose