So yeah. Contrary to all expectations I HATH FINISHED volume 12 before volume 13 is out! *clapclapclap*.
Well then, volume 13 is coming out today, and I'll be getting it today. And I'll be reading it today, can't wait to see how it ends... Although, according to author, the Another Mission 2 is going to have a short story of what happens afterwards, so that'll be nice too (Lapis wins Takerubowl YAAY).
Make sure to support the author and publisher by purchasing the books in original language, and official adaptation if available at any point in the future.
Edit: Volume 13 is out and I have finished reading it already. Now... I need time to get over it.