The Twins of Nebiros

"Complete the super lifeform and come back to save this planet." Taking the fate of his companions on his shoulders, the doctor escapes from the planet. He then kidnaps a middle school girl and performs surgery to replace her heart with the "super lifeform." However, before he can implant the control chip in her brain, the power of the super lifeform awakens...

Ocha's masterpiece of SF bio-horror.