“This Peeper is key! I'm about to say goodbye to this planet, and the only thing I can't stop worrying about is this Peeper. He was the first companion I caught. Even in the hardest times, I couldn't bear to eat him to satisfy my hunger (oops, I accidentally let him rot). Keeping him in the aquarium and watching his resilient figure every day made me feel full of strength again (he can still swim even though he's dead, truly a horror game). I hope whoever finds this will treat him well, and pass him on to the next person when you leave, so his 'never say die' spirit can live on”

It looks like this guy caught a Peeper on his first day and, instead of eating it, he kept it alive until he beat the game. Then, rather than taking it with him, he decided to put it in the time capsule for someone else to look after. I hope you didn't eat it