Tsuihou sareta Meika no Chounan: Baka ni Sareta Hazure Skill de Saikyou e to Noboritsumeru

Synopsis

Chris, the eldest son of a prestigious family that has been bestowed the profession of the sword for generations, is banished from his home after receiving the profession of "Farmer" in the Grace of Heaven ceremony. Amid his despair, he discovers that a special power lies hidden within his unique skill of poison resistance!? (Source: Kadokawa, translated)