Звездануться (2021)

Ken returns to a fireworks festival before Tada confesses his feelings to Rei.

Ken returns to their past celebration of new year's eve. He intentionally let his friends go and see the new year's sunrise by themselves, hoping that he would forget all about Rei.

Ken returns to just before Tada proposes to Rei.

Ken returns to the last photo of the slideshow where they are in Tada's party, Tada introduces Rei to all his friends. In the middle of the event Ken dragged Rei into their elementary school.

Ken plans to have a "coming from behind victory" over Rei, but as he heard Rei's opinion about regrets, Ken decided not to change the past but to act in the present. So Ken returns to just before he has to give a speech at the wedding banquet.