To mark the 100th chapter of Gekkan Shoujo Nozaki-kun and the release of the 10th volume of the manga, there will be a special vote to choose the center of the idol unit the above 6 characters will be forming. The idol unit will be featured in an upcoming cafe collaboration that will run from 3 Oct to 2 Dec.
To vote, go to this webpage: https://form2.square-enix.com/a.p/188/ and click on the image of the character you’d like as the center. You can ignore filling in any personal details (name, address, etc.) unless you live in Japan and want to win a prize. The ‘Submit vote’ button is the one at the bottom of the page. Please note that each person is only allowed one vote.