No Matter How I Look at It, It's You Guys' Fault I'm Not Popular! Vol. 1-17 Manga
(15 Books) 
 
by Nico Tanigawa  (Author, Artist)
Tomoko plunges into her second summer vacation as a high school student. Though determined to do her best at doing absolutely nothing, she ends up getting dragged to a school function in the early days of her break...Later, Tomoko sees Kii-chan again for the first time in ages. Can Tomoko triumph in a covert battle of wills against her little cousin...?