Breathe Deeply

Breathe Deeply (X細胞は深く息をする) is a manga by Doton Yamaaki. It has 476 pages and 14 chapters. It's the first work of Yamaaki that was translated into English.

Plot
A battle ensues over life and death, machines or clones, create synthetic hearts or grow them? Two boys, Sei and Oishi, fall madly in love for Yuko. Her loss wreaks havoc in their young lives as relentless memories cease to fade. As a result their tender hearts are dedicated to a dream that no one will ever suffer their excruciating pain again. But, is what they had thought been a lie? Is there still a chance that their suffering may end? Will mercy and love prevail?

Chapters

 * Chapter 1: Encounter
 * Chapter 2: Divergence
 * Chapter 3: Awakening
 * Chapter 4: Enemies
 * Chapter 5: Stoicism
 * Chapter 6: Truth
 * Chapter 7: Change
 * Chapter 8: Reunion
 * Chapter 9: Pride
 * Chapter 10: Character
 * Chapter 11: Fate
 * Chapter 12: Collaboration
 * Chapter 13: Providence
 * Chapter 14: Energy