This story was an advance review copy for which I thank the publisher, and it's a little bit weird and off the beaten track, which is a good thing. I think that's why it appealed to me. it;s also part of a series of "Dojo" books, and I have to warn you that it did not look at all good on a smart phone, so you definitely want to read it on something else.
The kids of the Dojo Daycare want to throw a surprise birthday party for their rather nervous sensei, and their sneaking around does little for his mental health, but they succeed in creating the surprise using hard-won ninja techniques, and in the end have a great birthday party, and a much relieved sensei! I think it's fun and playful and very colorful, but be warned: it might put sneaky ninja ideas into young children's brains!