You've got a kindness unit to teach and a room where one child is still sounding out words while another has already read Wonder twice. This is the set for that room. Eight picture books that all circle the same question — what does it actually cost to be kind, and what happens when nobody is — each meeting a child at whatever level they're working. Two of them are lessons in book form and say so. The rest are stories, and one of those stories doesn't let anybody off the hook.
The set splits three ways, and it's worth knowing which is which before you build a week around it. Two books are instruction rather than story: Have You Filled a Bucket Today? gives the room one shared word, and Be Kind asks the question out loud and thinks about it. Both are useful, both are frank about being lessons, and neither has a plot to speak of. Then there are the stories that let a child feel it instead of being told it — The Invisible Boy, Enemy Pie, Those Shoes, Last Stop on Market Street, We're All Wonders. These are where the unit actually gets its teeth, because a child works out the point themselves. And then there's Each Kindness, which is doing something the other seven aren't. Maya is excluded, Maya moves away, and Chloe never gets her chance to make it right. It ends on regret. If your unit needs to land somewhere other than a good feeling, that's the book, but read the heads-up first and don't let it arrive by accident on a Friday afternoon.