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

CHARACTER We Never Learn: BOKUBEN Official USA Website

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Kudasai on X: El 28 de diciembre celebramos el cumpleaños de

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

Bokutachi wa Benkyou ga - Bokutachi wa Benkyou ga Dekinai

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Bokutachi wa Benkyou ga Dekinai [Archive] - AnimeSuki Forum