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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Mafuyu Kirisu, We Never Learn Wiki

Bokutachi wa Benkyou ga Dekinai [Archive] - AnimeSuki Forum

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Bokutachi wa Benkyou ga Dekinai! Season 2 - Episode 9 discussion

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Bokutachi wa Benkyou ga Dekinai! Season 2 - Episode 9 discussion