Houseki Ouji to Itsutsu no Nazo

Suzuran Shirafuji is a cold high school girl who has lived without relying on others. After meeting a shepherd dog who talks like a madam, she is hired as a reciter and dog walker by the Mikazuki family, the largest mansion in town. Madam asks her to become a friend of Shidan, who has not left the mansion for 10 years, but...School Light Mystery Begins!