It's Reasonable for Him to Dominate the Magic World with Only One Trick, Right?

[Summon dragons and witches at will] [Fight seriously] [Never give up] "I don't care about your colorful magic, no matter how fancy it is!" "No matter who comes, I will use this trick: [Secret Technique·Invalid]!" "What you will need most in a while is: healing potion!" "Why don't you just come together, don't be scared!" "I live in a castle and have a beautiful wife who loves kisses waiting for me to laugh!" "If I get home late, she will be so anxious!" "Please remember, my name is Zhou Ying, and the one who wins by doing nothing will win, don't shout nonsense!"-----------------In a world where [Summoners] can cast five-color summoning spells with their bare hands, Zhou Ying, a young mechanical engineering student, plans to rely on just one counter-spell to go from a clear [apprentice] to a [great scientist] of spells!