My Magical Girl Sister Can't Be Ultraman

Originally, as the younger sister of Xingyue, the most invincible magical girl in the world, she should not only have a life of food and clothing and a harmonious family, but she should also live a smooth and leisurely life. What does it mean that my invincible magical girl sister was defeated by a thunderous alien who fell from the sky and quickly beat her with the power of thunder? What does it mean that I am about to become a loner? What does it mean that a giant thunder giant descended from the sky and used the power of thunder to defeat the giant thunder alien? What does it mean that the thunder giant and my elder sister merged into one body? (PS: This is the first time for a newcomer to write an article. This book prefers the XP writing method, but Ultraman will definitely be a hero and will not do things like I don't eat beef or have a harem. If there are any mistakes, please point them out, thank you♪(･ω･)ﾉ)