It was q life time for me, now I'm adult when i first watched the anime i was still at high school
I hope they chnage the ending so they meet sooner not in old age, it kills the Joy even thought they meet again.
the story strongly resembles Attack on Titan. the basement, strange power, apocalypse, lookig for a parent or wanting to reveal the secret of the apocalypse. it came to me when the boy had his arm chopped by a monster and it grew back. the blonde comrade like armin. hotheaded charcter