Katana

The katana is a melee weapon that can only be found in the greenhouse bunker.To unlock the first door, you need to go in the order of Japanese numbers 1-4 (一，二，三， 四）. This will then lead to a second room with flowers in it. The code to get it is Yin Yang, robe, growing plant, flower, rice ball, water, book, two leaves and stem, moon, Tori (weird building), snowflake, and man running. You do this by activating flowers. Worth it!.