Ep. 4: Rika muda dan Hanyu bermain petak umpet yang mengarah pada penyelesaian paradoks waktu

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A young Rika and Hanyu play a game of hide and seek that results in little Rika being thrown into a time paradox, where she finds herself sent into the future Hinamizawa everyone fought for prior to Kira. Hanyu, while out for a walk, finds the scared Rika and offers to help her. Thinking back, she remembers a time when Rika disappeared while playing a game with her. With the help of the rest of the gang, they find a way to send little Rika back to where she belongs. Hanyu is reluctant at first, thinking back at how much suffering Rika has been through. Little Rika tells Hanyu she wants to go back and does so. The episode concludes with Rika and Hanyu running to catch up with their friends after sending little Rika back. (Source: Wikipedia)