Super Shooter by Rip Slyme
Last Kiss by Bonnie Pink
In episode 1 Pie Jesu by Gabriel Faure is played before Gantz appears in the apartment.
In episode 1 Baikal by Tomoko Death is played in the background when the girl in Kurono's class noticed his boner. It also plays in episode 6, when Kurono buys the condoms.
In episode 2 Bubble by Tomoko Death is played in the background while the onion dad appears.
In episode 4 Titicaca by Tomoko Death is played when Kurono is back in his home.