My backyard is connected to the 2D world

Yang Yan was a 21st-century otaku. He had a wealthy sister who had recently moved to a new villa in the forest in the suburbs to live with her. However, driven by curiosity, Yang Yan stepped into his backyard. From then on, his life completely changed! What happened? Naruto World? I’m just going to the backyard to take a look. Is there a need to be like this?! Who can tell me how to go back!!!