Henohenomoheji to Bou Ningen to Pantsu

One day, an elementary student named Satou contracts a disease that turns him into a stick figure. The only way to cure this affliction is to stimulate the brain. And the stimulation for adolescence is... "love"?! A dramatic coming-of-age romcom from Jump's promising up-and-comer!

(Source: Shonen Jump Plus, translated)