A creative BL with a special setting: In a dying world where women are no longer born in extreme numbers. There was a group of people called “Rose” who fed on men's bodily fluids by parasitizing their rectum with a parasitic plant that resembled a rosebud.

Kanon, the adopted son of the leader of an expeditionary brigade, the Magellan Clan, is doing illegal pillow fights to keep the Clan alive. However, the officials find out and suspend his expedition for a year, which is his source of livelihood. In order to keep the group alive, the leader forces his son Kanon to become a Rose.

This is a serious story manga. It is generally adoptive father x protagonist, but it is a complicated relationship that cannot be called lovey-dovey.

The main character is a bit dense, but the content is heavy.