I have read to chapter 12 in the raws through google translate and what the novel is about is at night time these space portal things open up and bloodthirsty creatures come out the main character can temporarily transform into a giant for only around 10 minutes and from killing the creatures he can get points to improve himself is what got from reading to chapter 12 he reveals his power to everybody pretty early too chapter 5 where the creatures come out and attack at the school dormitory he staying at there is some slight nationalism but it's alright.
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