Bokutachi wa Benkyou ga Dekinai - According to some fans and in wiki. December 28 is the Birthday of Mafuyu-sensei. So, anyone here in Manga readers can confirm it, and please screenshot

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Which Character had the Best Ending : r/WeCantStudy

Bokutachi wa Benkyou ga Dekinai [Archive] - Page 2 - AnimeSuki Forum

Bokutachi wa Benkyou ga Dekinai [Archive] - AnimeSuki Forum

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Bokutachi wa Benkyou ga Dekinai celebra el cumpleaños de Mafuyu

June 2019 – RABUJOI – An Anime Blog