No Doubt About It, You’re the Protagonist

A visitor from another world! An undeniable protagonist! Naturally, arriving in the Middle Ages means becoming the undisputed strongest in the world! Time to write a truly satisfying power fantasy! The protagonist, Dao Tangtang, is serialized here! So, let's have a duel! You, the tutorial's pig-headed man! (Actually, this work is for adults. If anything makes you uncomfortable, just stop reading. You shouldn't force yourself, right?)