I Really Can't Time Travel

I can travel to other worlds, but why not let the ending be happy? I thought I could change the ending, but the result was disappointing. The story of the protagonist's survival in movies, animations, and novels. Newbies practice writing. Newcomers practice writing. Newcomers practice writing. Newcomers practice writing. Newcomers practice writing. Newcomers practice writing. Newcomers practice writing. Newcomers practice writing. Newcomers practice writing. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.