Spring Thunder and Noise

Suzu tried to lay low to avoid being linked to her flashy and popular older brother. However, once her identity as his little sister was revealed, her peaceful high school life came crashing down — she was thrust into the popular crowd, who fawned over her and tried to use her to get to her brother. To make matters worse, she was attacked by a delinquent who harbored a grudge against her brother. The one who saved Suzu from the attack was Hata, her brother's friend — exactly the kind of person she wanted to avoid. Even though she’s “just my friend’s little sister,” Hata somehow takes an interest in Suzu. Thanks to his forceful kindness, Suzu’s world gradually begins to take on a life of her own—

(Source: Ganma!, translated)