In a distant future where the sun no longer shines, Toshiro Kamiya gives up his body to a sinister floral metamorphosis for a payday.

The earth of the distant future is covered in thick clouds, and the sun no longer shines. Plants wither, and oxygen is thin. To fight extinction, humankind has developed a technology that turns humans into plants, providing a small amount of oxygen. Is this process sustainable? Is it ethical? Toshiro Kamiya must consider these questions as he’s faced with a difficult choice—save his family or save himself.

Hourai has received orders from Dr. Kudai and is off to a Buddhist temple to find the researcher who transflorated Toshiro. But even there, strange things have been happening amidst the spiriflora. Can Hourai figure out why an important ritual has failed—and who might have wanted it to?