Saya-san no Otetsudai

[]

The protagonist, who suffers from an illness called “Doll Syndrome,” which causes their body to stop growing at the age of 1○, teams up with Saya, a researcher who can cure the illness. In order to cure their disease, the protagonist decides to “help Saya with her work…”

https://i.imgur.com/EFCkTXy.png

https://www.dlsite.com/maniax/work/=/product_id/RJ01173579.html