Ore ga Shuyaku na Wake ga Nai

With a hobby of writing BL novels, Akiharu, a university student fudanshi who loves shipping, quickly approaches his favorite ship (a delusion)? His dream of becoming a wall that watches over them was fulfilled—was what he thought, but one day, a shocking truth from the mouth of the uke (a delusion)...! But reality is stranger than his delusions! This is a new era of a fudanshi's heartful comedy!!

(Source: Kadokawa, translated)