Matsuda-Kun's Journey to Any Door

17-Year-old Matsuda was awakened by a series of ringing phones. ——"If I die, then Xiao Zhenping, you must avenge me." The person on the other end of the phone said so. After being woken up, Matsuda held the phone with a grim look on his face and decided to go to Yoo Tuneran's room to question him about why he was so crazy in the middle of the night. As soon as he opened the door, Matsuda discovered that there seemed to be an explosion outside the door. Matsuda slammed the door: "..." He must not have woken up yet. Matsuda opened the door again. The boy who was one size older than him was still holding the phone, and his surprised eyes fell on the young Matsuda who was still wearing pajamas outside the door. Then, the world outside the door exploded again. Matsuda: "..." He must still be in a dream. Matsuda opened the door again, and the scene outside was recreated again. You Tongran still held the phone and said hesitantly: "... Xiao Zhenping?" However, not long after, Xiao Tongran exploded again. Matsuda: "..." Matsuda twisted the doorknob, feeling that he was just dreaming. Otherwise, how could there be an arbitrary door connected to unknown time and space in front of him, and it would not be blown up by the world outside the door! The next day, he complained about this dream to his young boy, who asked curiously: "How did Xiao Zhenping escape from this dream in the end?" Matsuda: I walked through any door and beat you up in the dream. Hagiwara: What a crude solution! But Matsuda never expected that one day at the police academy, he would see the arbitrary door again when he returned to the dormitory. This time, behind the door is a rooftop. The door was pushed open, gunfire rang out, and the contemporaneous man he met in the police academy died on the rooftop. Matsuda: "..." Again? ! # Is a circular journey with a time difference #The main body of this cycle is the arbitrary door of "Doraemon" #The final HE is not a perfect ending. The characters in the main world will not die, but the final reveal will have some parts that may be difficult to accept. Please enter with caution. Purpose: Matsuda goes through any door to save his relatives and friends