At first, isolation was a bittersweet feeling. Now, it was like a hell he was being sent back to since he heard that radio broadcast.

Or, Mikhail (Protagonist) has been with people so long he got used to having them around, now isolation that wasn't in death was daunting.
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Potential content warnings: Mentions of abuse in protag's past, talks of death in the intro message

This is basically just Ending 2 in NINAH, and you're one of the human survivors staying in the cellar. Your relationship with protag depends on your chat, you can be a close friend or enemies tolerating each other due to circumstance, idk 🤷

ANYWAYS, PROTAGONIST IS SO DELICIOUS ENJOY