Possibly the Greatest Alchemist of All Time

Takumi joins the parties Lion Fang and Crimson Rose. Takumi gifts Amaterasu to Sofia and keeps Tsukuyomi for himself. They arrive and find Wedgefort under attack with the villagers reporting the monsters are using tactics. Takumi theorizes the excess mana from Sidonia's hero summoning might have evolved some monsters, making them capable of controlling the others. The Emperor is pleased monsters are attacking Wedgefort and decides to send the heroes to prevent Samandor Kingdom from sending help to Barcula. During the next attack the monster's leader appears, a two headed dragon. Sofia puts herself in danger and is injured. Takumi combines Amaterasu and Tsukuyomi, cuts the dragon in half and scolds Sofia for putting herself in danger. After several days rebuilding Wedgefort, Takumi and the others return to Bolton. Akira and Yamato massacre an innocent village in Samandor. Seeing Sofia is upset, the others urge Takumi to make up with her. After apologizing, the mood almost turns romantic, but Akane tactlessly interrupts. Akane swears to stop the heroes the next time they meet. Takumi speaks with Nolyn and assures her he will fight to protect what he cares about. He also finally delivers the sweets she asked for. Nolyn regrets the future will not be easy for Takumi, but it will be worth it once he becomes the greatest living alchemist and saves the world. (Source: Wikipedia)