How to make a 3D origami heart

(page 14)

25th picture of 3D origami paper heart

25.

Apply the CP to the paper.

You should be able to get a heart-like model shown on the left.

Prepare to look at the side of the model.

26th picture of 3D origami paper heart

26.

Let's look at the left side of the model.

Prepare to work on the region (1) encircled with a dotted ellipse first on the step #27.

Then work on the region (2) in the step #28.