 The first, , in 2007, the second, , in 2009, the third, , in 2011, the fourth, , in 2012, the fifth, in 2014, the sixth, in 2017, the seventh, , in 2018, and the eighth, , also released in 2018.A guidebook, titled , was published by Kodansha on October 28, 2011.It includes complete information about the series' first fifteen years of serialization.