In addition to Önnereds HK, 51 other teams from 14 different countries played in Boys 18. They were divided into 8 different groups, whereof Önnereds HK could be found in Group 7 together with Waasmunster HK, Frisch Auf! Göppingen 1, Spånga HK, Fjellhammer IL and HF Mors. Önnereds HK continued to A-Play-off after reaching 2:nd place in Group 7. In the playoff they made it to 1/16 Final, but lost it against Union West Wien 1 with 15-22. In the Final, Haslum HK won over IK Sävehof 1 and became the winner of A-Play-off in Boys 18. Önnereds HK also participated in Boys 18 during Partille Cup 2013. They reached the 1/8 Final in B18 A-Play-off, but lost it against Redbergslids IK with 8-23.