Freezing Rebirth

(First of all, this is generally just exercise for me, so I will be writing without too much preparation, please give me feedback if you see anything :D ) A man named Haruto Yukimura lived a decent life in the town of Shimokawa. Things had always been quite peaceful. He moved down to Tokyo to study chemistry, but on the way, the train derailed. Sometime after, the young man wakes up, deep in a cold cave. While somewhat bewildered, the young man starts to search for civilization.