I Asked You to Study Science, but You Became an Immortal?

Originally I just wanted to study hard and become a scientist, but somehow I became an immortal. If you become an immortal, become an immortal! But why should we fight against foreign invaders? It will kill people! Well, it seems that if you don't resist, you will die if you are invaded. Be confident and remove it. Alas, now that it has come, let it be at peace. You can't do it if you don't resist. After all, you can't enjoy it. If you don't resist, you'll be left in the cold. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.