Ultra Despair Girls (UP)

Story Related and Cannot be missed.

Chapter 4 begins with you following someone through the streets. Keep following him, occasionally warding off attacking Monokumas, until you get to a Chinese temple. Here will be a mini boss fight, which has a trophy tied to it, so see A Woman's Battle for more information. Afterwards, you can carry straight on with the objective but you'll have to go a bit out of your way for collectibles and arcade sections, but the collectible guide will guide you through it. Once finally in the subway, you must head back to the sewer to where the base is. A lot of enemies, puzzles and dialogue later and you'll be at the base. You'll need to defend another attack. Afterwards, you'll be taken to a factory. You must make your way through, avoiding lasers and doing more arcade rooms, til you get to the final area, where a boss fight will occur, but not in a Colosseum like usual. It'll take part in a room with a lot of cover, because you'll need it. The boss is a robot which shoots at you. You'll need to allow it to lock onto you then take cover. After 3 or 4 shots, you will will get a chance to shoot at the eye. Early on, the robot will fall over and you'll get more shots at it. Later, you won't get any extra shots at it. It will also occasionally throw bombs which you need to avoid. Eventually, it will be defeated, and it'll jump back to the middle, and release a payload of bombs, so don't do what i did and get caught in them and die. The trophy will unlock at the chapter end screen.