Slow living with Princess — red was expelled from the detachment of the heroine, who went on a campaign to defeat the Demon Lord. He goes with the front line and opens a pharmacy at the border called Zoltan. Now his new happy life depends on a relationship with the former Princess Tsundere hot-cold personality and his lovely younger sister Ruth, who is the world’s only hope of victory over the Lord of Demons as the heroine. Three years have passed since the invasion of Avalon by Tarakson, the Dignity of the Demon Lord, who ruled the Dark Continent. In just three years, half of the continent fell into the hands of the Demon Lord.