I didn't get to see Riku-kun's grown up face, 😭

I think the last page ( color page) of the final chapter is him
It look like him when he young

Oh yes, its him. I didn't notice. I always skipping pages when its like credit pages. Thank you so much. Gosh! Riku is so handsome..

It was also shown in the first chapter. So handsome! My nth time reading this.

http://www.mangago.me/read-manga/sekai_wa_shippo_de_dekiteiru/uu/sekai_wa_shippo_de_dekiteiru-chapter-1/3/