Ryofu Housen, a formidable general resembling Lu Bu from the Three Kingdoms, experiences a bizarre twist of fate when he, along with Chinkyuu akin to Chen Gong, plunges to Earth and awakens in the body of an elementary school student. Struggling with their newfound childlike forms and interests, the duo embarks on a quest to reclaim their former selves. However, their journey is fraught with challenges such as familiar foes, colossal battles against monsters, and a pressing mission to acquire Eri-sensei's coveted F-cup bosom.