One-Coin Sat-chan"

The girls search for a weapon that they can buy with their New Year's money, eventually settling on some walkie-talkie. Afterwards, the girls follow Colonel Monochrome to see where he goes all the time, ultimately winding up back at their hideout. Later, the girls decide to make a time capsule filled with things to give to their future selves before trying to find a place to bury it.