Remember Your Friends

You are at a friends house looking through some of his otaku goodies that you see pictured here.
All of a sudden you hear a rumbling noise which then turns into a tremor - an earth quake. The whole house starts to shake violently and the floor splits open. Your friend falls through the floor into the bottomless pit - you reach out to him but its too late.

As he was a good friend, you decide to take an item to remember him by. The earth quake is getting stronger and the house starts to cave in - you only have time to grab one item. Which item do you take?