Comment by Booroobora on The_Reader

MC sees what happens to the other version of himself who he realizes was actually back in his original world. When they were kids MC had switched places with the other version, and forgot (probably cause it was traumatic) so MC had actually been sent back to his OG world this whole time. It shows the the other version meeting the other version ML who the "game" was based off of. Then MC seeing all this realizes he needs to get back to ML and the watch leads him back. ML had turned back time 1 month before their original meeting before MC had switched places. So he waits anxiously for MC to switch back by living next door for a whole month. When he hears MC comeback, he runs next door with flowers to redo their first meeting. MC doesn't remember anything and ML tells him everything that happened. That's the end of the main story