Cold
The roof, even though it's almost spring, is still covered in ice so it's cold. Inside the house is cold, outside the house is cold. Everything is cold!
Picture the entire roof covered in ice. It's supposed to be spring right now, but it's too cold for the ice to melt off your roof.
かん
さむ
None
You can't stand the cold anymore, so you hire a samurai (さむ) to come try to hack the ice off of your roof with his sword. You stand outside shivering, and watching as the samurai tries to stab the ice off of your roof.
The samurai isn't doing a good job stopping the cold, and soon he and his sword have frozen into your ice roof. So now it's cold and you have a dead samurai stuck to your house. Great.