My Darling In The 90s

The is about a young guy who's graduating from high school. - Before his school life ends, he wants to confess to his crush. Her name is Rei and she quickly turns him down, crushing his dreams in public. - The embarassment turns to motivation as he continues spending the following years in solitude. - During that period, he turned his ordinary smart phone into a time travelling device. His goal was to undo his confession mistake but only ends up sending himself back all the way to the 90s, where he meets a different kind of girl. - One that might end up being his true love. - Spoiler