Shibou End o Kaihi Shita Gyarugee no Hiroin-tachi ga Ore no [Nikki-chou] o Yonde Himitsu o Shitta Rashii

I reincarnated as Iriya Satoshi, a mob character in a gal game world. But for some reason, the heroines are worshipping me?! And to make matter worse, every single one of them is a complete yandere... "I'm sorry. Please don't throw me away. Don't hate me." "...I only have eyes for you. We'll be together forever, right?" The actual protagonist is right there, so why are they all coming after me?! By the way... where did my [Diary] go?