looks like this got dropped, so if anyone wants to know what happens in the last 3 chapters, here's a summary:
everyone decides on serika as the one that should survive, and she brings mc-kun to the gym, where the demon waits all of htem and laughs at them. demon-girl mocks mc-kun about the whole thing and mc-kun finds out about the game and what the 5th game is and etc. then serika (as part of her strategy) goes off on mc-kun and how she would rather die than get with him. the rest of the girls pick up on it and say the same thing. demon-girl laughs at their attempt to screw with her game and brings em all to hell and tells him to pick someone. serika hints to mc-kun about who really likes him the most, and he realizes it and starts 'liking' demon-girl. this adds her to the game much to her chargin. then more back and forth banter between demon-girl and everyone else. demon-girl is surprised that mc-kun figured out about serika's plan, since she thought mc-kun was a total idiot, and he goes how he was changed because of hanging out with the girls. she then receives notification on her phone that she lost, and she realizes that mc-kun played her as he declares that he now hates her the most, which causes her to lose her hearts. she gets dragged down to hell and 'dies'. everyone goes back to the real world, where mc-kun apologizes for the entire mess, but the girls are not mad at him. he realizes he was too foolish before and promises he will improve himself. they all agree to pretend that the whole thing never happened and part ways.
later, serika returns to her kinda boring study-filled life and notices mc-kun starts becoming popular and how much hes changed. she wants to ask him to eat lucnh with her but sees he is eating with that rich girl instead, whcih surpises her. she then thnks back and realizes what rich girl said earlier, that she would naturally be intersted in him even withtout the game, cuz he's chock full of good luck. the other 3 girls arrive too with the same idea, and all of them mention that they want a taste of that terrific luck he has, and also how much he's changed aftewards. she thnks about it a bit and while he isn't in her ballpark now he certainly has a lot of room to grow, and his good luck is obviously a huge plus. so she claims to the others girls that she'l lbe the one to win. they all have lunch together and have fun etc, and serika thnks 'well this is certainly better htan my previous grey life, all of us here laughing and having fun, the spring of our youths etc.'