Mald/Chronology

Volume 3
Itsuki's group, including Mald, deposed a governor who was instilling high taxes and tariffs.

Later on, when Malty framed Naofumi for kidnapping Melty, Itsuki's party chased after the Shield Hero. Mald tried to kill Naofumi but he was able to escape.

Volume 5
At the conference of the four heroes, all of the party members of each hero introduced themselves. During the introductions, Mald almost picks a fight with Ren and then with Raphtalia. He is then scolded by Itsuki for causing trouble.

While the heroes were in Cal Mira for the bonus experience event, Itsuki's team, including Mald, stole other people's kills for experience. When they had lunch, Mald bossed Rishia around and gave himself a feast while Rishia had a single piece of fruit. He then boasted of all of their accomplishment to Naofumi.

Volume 6
Mald later betrays Itsuki, and then his entire country by starting a separatist faction with Princess Malty, some other members of Itsuki's Party, and the remnants of the Church of the Three Heroes. Though he is not a staunch believer of the three heroes church, he sided with them to regain his lost pride. According to Kyo, Itsuki was tied up by his party members as a sacrifice for their escape.

Volume 12
Itsuki fought in the consortium in Zeltoble believing Mald and Malty's word of saving money to rescue people. Later, it was exposed that Mald and his group lavishly spent all the money earned by Itsuki.

Volume 17
Mald and the others who left Itsuki in Zeltoble had been missing for quite some time. However, when Naofumi and his companions went Glass' World to confront Miyaji, a vanguard of the waves, Mald and Malty appeared to back up the villain. Mald had the Vassal Axe which had been missing since it had been liberated from Takt. The Vassal Axe had been suppressed and Mald applied as many power-up methods as he knew to gain incredible power. Spouting nonsense about "true justice" and how Naofumi was the "Devil of the Shield" and Itsuki was the "Bow Imposter," he attacks the heroes.

As Miyaji was losing in the fight, he tries to take the Vassal Axe from Mald but is killed instead. Just as Rishia and Itsuki are about to defeat Mald, Malty takes the Vassal Axe. As the two villains are about to be defeated, S'yne's sister rescues both of them and teleports them away.