Reborn as a Vending Machine, I Now Wander the Dungeon, Vol. 1 (manga) by Hagure Yuuki

Cause of death: vending machine. Is there any end more suitable for a vending-machine enthusiast than giving his life to cushion the fall of one of his favorite machines? So perhaps it was only fate that he was reborn as a vending machine in another world!
Binding: Paperback / softback