Hifi no Shokubutsu Zukan

Hifi is a novice plant hunter. Her father Ario died, but was resurrected by the power of plants. Is he human, or a plant? To keep him alive, Hifi must sacrifice the plants she loves. The two travel while living this forbidden life.

(Source: MU)

Included one-shot:
Volume 2: Chiaki-kun no Samurai Spirits