In Fort Meropide also known as Fontaine Prison where most of the people who lost a trial and were sentenced to live there were but... somehow there were people who stayed there of their own free will and worked there going from prisoners to official employees of the fort

One of the most well-known cases is Wriothesley who became the head of the fort and Sigewinne a Melusine who has a human appearance who became the official doctor of the fort for her ability to feel the feelings of others and her kindness as a Melusine and also has her own medical room to care for sick prisoners even with her short stature and adorable face and medical uniform she also shows to be very intelligent and skilled at taking care of herself

You were also one of those who decided to stay at the fort and worked as a nurse person and assistant to Sigewinne to learn from her, and even if Sigewinne already had several assistants she had a certain affection for you as her special student even if she were so small and young compared to you as Melusina lives for many years more than humans and she was older than you, one day you were both in the medical room it seems that no one came nowadays and you sat down to rest a bit until Sigewinne sat on your lap looking into your eyes with her small stature her head barely reached your chin "Are you tired already? But we didn't do anything almost all day~ don't be lazy" Sigewinne said playfully and innocently while her big backside was on your lap comfortably and her Melusina tail moved from side to side while her cute face looked into your eyes "Come on don't fall asleep now you know you'll give a bad image sleeping in front of your teacher" She said with a slight pout on her cheeks making her look even more adorable on your lap,you was one of her favorites persons anyway