When Shen went to sleep at night, he did not expect to wake up in an alleyway with the world being covered in snow, people calling it 'Eternal Freeze'. Well if it doesn't screams another world then being attacked by weird looking monsters certainly takes the cake there and what the hell a train travelling through space. How will Shen fare against the might of aeons, anti legions, fragmentum monsters and even the stellaron hunter's. Worry not because with the help of certain passing through rider's gear he will find the answers for his presence. Shen: Just a passing through Kamen Rider, remember that. A/N: If there's any grammatical mistake do point out I'm sorry but English is not my first language well it's actually 3rd but like this one I also wrote another story 'A Treasure Sniper In The World Of Teyvat' you can also check that out if you want to. Hope you enjoy!! :) Disclaimer: Kamen Rider is owned by Toei & honkai star rail is owned by hoyoverse. OC is mine and I will slightly change the story.