Kashimashi Omnibus TPB Volume 02 (Of 2)

"(W) Satoru Akahori (A) Yukimaru Katsura Thanks to a freak accident with an alien space ship, Hazumu has had to get used to living life as a girl instead of a boy, plus her relationships with childhood friend Tomari and first love Yasuna have developed into a delicate love triangle. Now, the alien that caused this situation informs Hazumu that she only has thirty days left to live. The chaotic and conflicted all-girl love triangle comes to a shocking resolution in the face of Hazumu's biggest challenge yet - her own mortality."