Hayate no Gotoku!

Synopsis

Nagi and Hayate believe that Maria has gotten upset when they thought she looks older than her actual age, so they thought about telling Maria to take a break. Wataru said to them that Maria is not the kind of person who would take even one break. But, Saki just made a plan for Hayate and Nagi to give Maria a day off. They surprise Maria with an overnight relaxation tour at the Hyatt Regency hotel. When Hayate orders for room service, they meet Izumi and find out the students of Hakuou Academy are running the hotel for a one-day experience event. Maria enjoys a few of the hotel facilities until the students are unable to accomplish their jobs and ask Maria for help, especially when Kirika and Shion visit. Maria spends the rest of the day helping the students in secret from Nagi and Hayate. The next day, back at the mansion, as both Hayate and Nagi were going to thank Maria, she said to them that she is the one to thank "them" because all that matters to her is the smiles from everyone, including them.

(Source: Wikipedia)