I Went from the Bottom of the Monster Beast to a Giant Beast in the Starry Sky

Three years ago. A huge tower suddenly appeared above the city and people didn't take it seriously at first, but the successive disappearances began to cause people to panic... Our male protagonist was forced to investigate but unexpectedly entered another world. Then the tower took the earth into the tower and disappeared. After waking up, the male protagonist found himself in a virgin forest? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.