World's Finest Assassin Gets Reincarnated In Another World As An Aristocrat (Manga) Vol 03

Lugh's fight with the formidable Setanta comes to an end-but will his assassin's trump card actually reach his overpowered opponent!? Then, when Lugh enrolls into an elite academy, he finally meets his target: the hero! Yen Press
(W) Rui Tsukiyo, Hamao Sumeragi (A) Reia