I can only get Reina's ending

[TheOnask]

So I finished the game the first time taking random choices as the guide here says, got Reina's ending, which is actually weird as I can see. Also, didn't get the 16th, 17th chapter, epilogue or Normal End trophy (?)

Next time, starting a complete New Game, using the L2 function, I skipped all the already seen text and strictly chosed the Owari ending choices in the guide. Around the end, where you go to the festival, I unlocked the "Our Summer With Owari Has Ended", but after that, I ended up getting Reina's ending again (?) Also, didn't get this time none of the chapter, epilogue or normal ending trophies that I have left previously mentioned. 

 

Can someone tell me what it's actually going on?

 

Getting this platinum it's actually more boring than frustrating, period.