Boku wa Tomodachi ga Sukunai

aka Haganai

D-Frag!


When Naganuma was described as an otaku, the three anime characters who appear behind him resemble:
 * Charlotte Dunois from IS
 * Kureha Sakamachi from Mayo Chiki!
 * Kobato Hasegawa from Haganai

All of them have the same seiyuu (voice actress), Kana Hanazawa (once seiyuu of Roka Shibasaki), who may possibly be Naganuma's favorite.

All four (D-Frag!, Haganai, Mayo Chiki!, and IS) manga are published by Media Factory's Monthly Comic Alive imprint.