The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat - Season 1 - Eps 3: Magic of Bonds
Lugh's magic teacher is a pretty girl named Dia. Being a few years older than Lugh, Dia treats him like a younger brother and sneaks into his bed every night in order to sleep next to him. Because he needs her to teach him magic, Lugh can't complain, but gradually he and Dia grow closer--
About The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat

Title: The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat
First Air Date: 2021-10-06
Last Air Date: 2021-12-22
Status: Returning Series
Rating: 8.2/10 (from 244 votes)
Language: JA
Seasons: 2
Total Episodes: 13
Network: AT-X
Genres: Animation, Action & Adventure, Sci-Fi & Fantasy
Production Companies: SILVER LINK., Studio Palette, KADOKAWA, Bandai Namco Arts, Crunchyroll, AT-X, movic, KADOKAWA Media House, Glovision, TV Aichi
Synopsis
The world's number one assassin has been reincarnated as the eldest son of a family of aristocrat assassins. In exchange for being reincarnated in another world, a goddess has imposed upon him one condition. "Kill the Hero who is prophesied to destroy the world." This was to be the mission in his new life. The synergistic effect of the vast knowledge and experience he gained that made all manner of assassinations possible in the modern world, and the secret techniques and magic of the fantasy world's most powerful family of assassins turn him into the greatest assassin of all time.
Cast

Kenji Akabane
Lugh (voice)

Reina Ueda
Dia (voice)

Yuuki Takada
Tarte (voice)

Shino Shimoji
Maha (voice)

Toshiyuki Morikawa
Cian (voice)

Chiaki Takahashi
Ethilu (voice)

Yukari Tamura
the Goddess (voice)

Junpei Morita
the Assassin (voice)