Ilegenes: Giyoku no Koukyoukyoku, No.6 Recommendations
Nezumi and Shion are like Fon and Jaques in certain ways. Fon and Nezumi both lost their families tragically. All the characters have learned that there are still people willing to help other people even at the detriment of themselves. There's also the theme of geniuses in both series, and the idea of a place that may seem ideal on the outside but is really corrupt underneath. Both have the main characters changing each other in many ways, and almost the same level of BL and darker themes.