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The main character is a boring high school kid that likes to write about his every day in a cell phone.Some day he is summoned by the god of of the universe for a battle royalle game where the survivor is selected to become a new god.I his first battle he is helped by a pink-haired obsessive girl that manages to kill the enemy that he much strived to beat.He finally realized how helpless he was the whole time and how he need help all along.The two spend some time together and then he falls in love with the girl.
Unable to confess, he is gifted with by deus ex machina with a future diary phone number. Never minding the strange area code, he immediately clings to her, and is terrified to find out that she want's crush on him as well.
But, the next day, when he tries to avoid the the girl, she only looks at him with a creepy expression. After some investigation, he finds out that the girl he called is not the same girl he fell in love with. In fact, she doesn’t exist in this universe at all. She is the girl’s previous universe, who has fallen in love with the MC’s own PU self, who too is blissfully unaware of her crush cuz he dead.
Hijinks ensue as the two strike up a deal to give each other their darkest, most private killing methods in order to equip the other with the weapons they need to pierce the heart of their victims. While the two chase their respective targets, DRAMA ensues as they begin to fall in love with each other instead and question the NATURE of Yandere.