Physical book available at melon: https://www.melonbooks.co.jp/detail/detail.php?product_id=2587543&srsltid=AfmBOoqMp4b32rv25fiADEJG0YHCQArpv90aJpBOkgatRaAynWKugSbE Amazon: https://www.amazon.co.jp/-/en/%E3%82%82%E3%82%82%E3%81%93/dp/4768319777/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr= Digital (Kindle edition): https://www.amazon.co.jp/-/en/%E3%82%82%E3%82%82%E3%81%93-ebook/dp/B0DJVCF6XG/ref=tmm_kin_swatch_0?_encoding=UTF8&qid=&sr=