Magical Girl: I Don't Want to Be a Villain

Yuichi Maehara who traveled to the world of magical girls, Looking at my sister Maehara Karian who automatically inherited for free in front of me, When he was about to be bullied by the tentacle monster, he took out a long sword from the original owner's body. After chopping vegetables and dealing with the tentacle monsters, In that case, should I stand on the opposite side?