I’ll save the punchline for those who solve the puzzle.

It’s the end of another month, and so time for another Gattai!

This will also bring this run of Renban puzzles to close. For now. I do like Renban as a constraint, but I’ll try to mix things up for a while.

Rules:
Normal Gattai-3 rules apply. That is, there are three overlapping 9x9 Sudoku grids. Within each Sudoku grid, each row, column, and 3x3 box contains the digits 1-9. Boxes are shared between overlapping grids, and the box at the center is shared by all three grids.
The marked diagonals contains the digits 1 to 9 exactly once each.
Digits on each hollow pink line form a non-repeating set of consecutive digits in any order.
Digits on thermometers strictly increase from bulb to tip.
Digits within circles appear at least once in cells touching the circle.

Estimated difficulty: 2 out of 5

Solve on SudokuPad
Why Was Six Afraid of Seven?