An official spin-off doujinshi to the "Oniichan wa Oshimai!" / "Oniichan's End" series. Contains three short comedy stories set in Mihari's research laboratory.
"BUATSUISOU," the sharehouse that 159cm tall high school student Kotatsu moved to turned out to be a BIG house where everything is BIG! Including the inhabitants which are all over 2 meters tall! Part 2!!!!!
"BUATSUISOU," the sharehouse that 159cm tall high school student Kotatsu moved to turned out to be a BIG house where everything is BIG! Including the inhabitants which are all over 2 meters tall!
Having been feminized by a suspicious drug given by his little sister, what fate will Oniichan face...!? (The manga parts of RJ247862, RJ273796, and RJ296502, bundled together!)