Chatting by the Stairs

(from ebookjapan):

What will happen to the love triangle surrounding them? Kanan Morimoto, an eighth grader, has a complex about her naturally permed curly hair. Kanan's schoolwork, friends, and love life are not going well, but she is helped by the kindness of her fight buddy, Sen Nakayamate, and before she knows it, she has fallen in love with him.

Like a pair of ladybugs, Kanan thinks they are well-balanced, but there is a girl by Line's side who goes to a different high school and seems to be friendly with him!

Contains bonus one-shot "Cocoon-Bound Piccadilly" in volume 2.