help me find the name of the anime

[cheolsoo]

there was an anime that i watched on youtube where a girl who's short and has brown haired pigtails dated a tall guy with black hair in elementary but the guy is popular so their peers do not approve of their relationship and could always find ways to sabotage it. the mc's friend also dated a blond guy and they often do double dates. one of the episodes include the main character and her boyfriend playing a flute on the roof and one where they had physical education on the gym and they were learning dance (?). i watched the whole series on youtube and could find it on google then but i forgot the name