I absolutely adore Mahouka with all my heart, and am proud to make my own release of Reminiscence Arc.
Expect a full release including both seasons and both movies at some point, but for now I’m just putting this one out there.
While I don’t recommend watching this series in particular dubbed (though the dub itself is fine), I am including it for the sake of completeness, as nobody else has done a full-size release with USBD dub audio.

Sources:

Video, JP audio are from Sam v3 (https://nyaa.si/view/1632728)
Dub audio is from KaiDubs (https://nyaa.si/view/1668254)
Subs are my own edit partially based on Rom & Rem’s dialogue edits (https://nyaa.si/view/1472844) with Sam’s styling and S&S.
(Among other touch ups, I caught quite a number of honorifics that Rom & Rem missed.)