Monster Soul

Monster Soul is a manga series by Hiro Mashima.

Chapter 3
Mamii goes to take an Off Screen Shower but before while she is seen Stripping discovers that Aki and James doodled all over her body while she was asleep causing her to quickly come out of the bathroom and jump kick them both. 

Volume 2 Extras
Mamii is seen wearing a Towel after having an Off Screen Bath in a Freestanding Bathtub with a Rubber Duck in it while staying in Selshu's house. She discovers that she forgot to bring a change of clothes with her into the bath and asks James to go get her some as he smashes into the bathroom to hear the order making it another mishap for Selshu to get annoyed at.