Hanakotoba no Inouryoku wo Te ni Shita Ore wa, "Gyakkyou" no Chikara de Musou suru

Synopsis

Confronted by parasitic plant monsters called "Weeds," the protagonist Yuu finds himself in dire straits against their overwhelming power. In this moment of absolute crisis, Yuu awakens to an unknown ability that transforms him into a Weed. This is a world where the language of flowers becomes supernatural powers. With the ultimate ability that blooms in "Adversity," he'll mow down every enemy!! (Source: COMICSMART, translated)