Sugar Apple Fairy Tale: The Silver Sugar Master and the Water King(2012)

Sugar Apple Fairy Tale: Ginzatoushi to Mizu no Ousama

Mithril is at death's door, and if Anne wishes to save him, she must join Challe to search for Lafalle—the only fairy known to have recovered from certain death. But when Anne asks to take a break from her work with the silver sugar fairies, Hugh shows no mercy. Must Anne really choose between her status as a Silver Sugar Master and Mithril's life?!

(Source: Yen Press)