Shin-chan views relationships in a healthy way now! Instead of feeling dismayed about his life and seeing these girls who want to repent as a burden, he's ok with interacting with them again! They're so happy that the damage they did wasn't irreversible, and they're so thankful that they can talk to him again.
Anri really changed the trajectory of his life, and he too helped give her the confidence to write again. Seeing their books together reminded them of the journey they went through. And though we don't see them kiss, it's quite clear that they're so in love!