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![☄️RELEASE☄️[231201][サイバーステップ株式会社] 数学と親友とネタ帳 - Math, BFF, and Notes - [JP/CN/EN/Etc.]](http://imgs.anime-sharing.com/_preview/%2Fproxy.php%3Fimage%3Dhttps%253A%252F%252Fs8d7.turboimg.net%252Ft1%252F96078507_library_600x900_2x.jpg%26hash%3D2ce0effdfeec52ff849d3dae99600591)