Three years ago, Neneko's father passed away, and she moved in with her sister, Nanako. Living together, they shared perfect harmony until Nanako's recent strange behavior. She would disappear after spending nights away from home and eventually given up her job, which made Neneko worried. In her quest for help, she remembered her father's advice to contact Raubritter when in need.
Neneko found Raubritter, where she met with Shinobu and Yokana, cousins passionate about solving cases without expecting any compensation. They specialized in assisting distressed young women with the connections they had in their network, and Neneko's father had previously aided them. Albeit heartbroken by her father's loss, they were eager to support Neneko in finding her sister.
Will the trio locate Nanako? Could this partnership lead to something more significant for the cousins and Neneko?