Whose Hellos Are These, Anyway?

In a bustling metropolis where past lives intertwine, you play as an unassuming mail clerk who suddenly finds themselves at the center of a bizarre mystery. Each day, you receive enigmatic messages containing just a simple 'Hello'. Your quest is to unearth the owners of these greetings by delving into a web of intriguing relationships, peculiar characters, and hidden secrets. As you navigate the city's underbelly, decipher clues, and engage with a cast of quirky personalities, the stakes rise and the truth becomes increasingly elusive. Can you crack the case of the mysterious hellos before the city swallows you whole?