Yomikawa, for the most part, is a known avid reader of books, where she often visits the school's library, as well as her home having a library. She is known to read philosophical books, going so far in reading Friedrich Nietzsche's books including "Also Sprach Zarathustra", as well as other books including "No Longer Human" by Osamu Dazai. Despite her smarts, however, Yomikawa is also shown to be a comedic dimwit, due to her repeating several school years in the past, citing her rather odd reasoning as "an eternally beautiful girl is eternally a high school girl...", much to the annoyance of Big Sis Tsukishima who she was also classmates with. She always has 2 books on top of her head (which are what She's reading at the moment).
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