[Yawaraka Shoten (Yawaraka Black)] Maho to Chovy wa mada Tsukiawanai (Girls und Panzer) [Digital], [やわらか書店 (やわらかブラック)] まほとチョビはまだ付き合わない (ガールズ&パンツァー) [DL版]
Taken from the foreword:
By some strange coincidence, Nishizumi Maho and Anzai Chiyomi started to live together. Every day is a heart-pounding life full of love and affection. That’s the current situation for our young, gentle-hearted MahoChobi couple.