追放されたおっさん鍛冶師、なぜか伝説の大名工になる ～昔おもちゃの武器を造ってあげた子供たちが全員英雄になっていた～

Tsuiho Sareta Ossan Tanya Shi, Naze Ka Densetsu No Daimeiko Ni Naru Mukashi Omocha No Buki Wo Tsukutteageta Kodomo Tachi Ga Zenin Eiyu Ni Natteita

The protagonist, Delate, is a 40-year-old blacksmith working in a provincial city. One day, he is suddenly banished by a colleague from the guild.He then heads to the royal capital relying on a letter he received from a girl for whom he had previously made a "toy weapon." He finds that the "toy weapon" he made has evolved into a legendary weapon, and the girl has become a national hero!He makes a huge turnaround from being an unemployed old man (40) into a hero who has made a legendary weapon!He also unexpectedly reunites with the colleague who kicked him out, and takes him on as an apprentice!?