Buzzing 読書

絶対に好きだけど、テーマや内容的に人に勧めるのはちょっと......という本を教えてください。
Please suggest me books which you absolutely loved but would think twice before recommending it to someone because of the theme/content.
from /r/booksuggestions
ブックアドバイスreddit
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books.buzzing.ccで、本の話題を確認できます。