Hamedori-kun is the mascot of Seiran Island. 

Seiran Island is a place like no other, to deter emigration and attract tourism they have become the 'sex' destination as residents are punished if they are not have having frequent sex! On this crazy island, Hotori Misaki is still at school and one of the rare virgins trying to keep her secret and find love in such a lewd environment! 
 
Note: It was announced on October, 2021 that the publishing rights of the manga were acquired by Shueisha. The manga started being published on the Ultra Jump magazine since November 18, 2021.

"I'm going to destroy the Perverted Sex Law." 

Note: This is an adaptation of an eroge, although doesn't specify whether it will be a hentai/adult work. Data is subject to change.