Skull

From top to bottom - left to right:

"Youjo Senki" Volumes 2 (Plus Ultra) and 3 (The Finest Hour). "The Night Is Short, Walk on Girl " by Tomihiko Morimi the same author behind Tatami Galaxy. "Psycho Logical" Parts 1 & 2 which are from the Zaregoto series. "Fate/Prototype - Pale Silver Fragments" volumes 1 & 2 by Hikaru Sakurai. And finally Musubimonogatari by Nisioisin.

So only a ...