"I really think our mc is sorely lacking in critical thinking and intelligence."So what do you expect? He is having a high level of chunibbyou syndrome even though he is denying it saying he graduate that from when he was as a kid and now he thought his sister is having it too. It is more like the upgrade max level of chunnibyou version. He is not a regular chunnibyou that you can find on any generic anime/manga/novel. That's the different between this character with other manga/novel/anime's character. He act upon something that he likes and dislike and what choice do he have. He is still a kid btw. Under 21 years old that is.
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