jjcheby's manga / #not bl(3)

questionably ongoing 13 chapters Sakaki Yuuto (17 yr old student) has a job: breaking up relationships by making the girl fall for him. he's hot but can't do much with girls. the lil bro chases the males and big bro guides from behind the scenes, but can he charm the target and obey the number 1 rule to not fall in love with the target?

ongoing shoujo not bl, find a summary somewhere else