14. River City Sexy Girls 2 / Boss: Ryuji + Ryuichi, Helicopter (Nightmare Difficulty NG+ Kyoko)
3I don't know why the game lists these two twin brothers as a boss fight when you actually fight Ken yet again with the twins as special help. So same fight as before only this time Ken summons the twins for some quick help. After the fight you must rescue 6 hostages scattered all over the city. On Normal Difficulty you get a generous 20 minute time limit to rescue them, but this is Nightmare Difficulty so the game only gives you 10 minutes! Thankfully the hostages are near or at bus stops so check the map frequently and plan accordingly. Once you locate a hostage you must untie their ropes which takes some time. Baddies will show up to waste your time. Due to the strict time limit just knock them away from the hostages and focus on untying them. As for the attack chopper, it's a longish fight on Nightmare Difficulty because you can only use grenades to damage it. Just beat up the guys that jump from the chopper and take their grenades.