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(Y/N) Williams he is known as the traveling interdimensional hero known as Dragon Knight has fought against his greatest enemy and finished him. He was going home but.... He did not expect that he landed in the another world called Teyvat. Saving the little fairy from drowning name Paimon. He encounter meeting Lumine one of the traveller got separate her twin brother.

And now he made the promise for her to return her twin brother again, he is Dragon Knight!