Tale of the Maiden: Soul Eater / Shoujo Senki Soul Eater

The hentai was made in 2010 by studio Schoolzone based on an original visual novel by studio Lune. It is a sort of prequel to "Shoujo Senki Brain Jacker".

Ryusuke planned to kill the head of the bandit clan Kamaira, but the plan failed, and at that moment his sister Misa intervenes and exchanges his freedom for her own. Despite the danger, Kamair decides to gather a team and save his sister from captivity. Makoto joins his team, who lost her family to the raids of Kamair's bandits...