In addition to the two Önnereds teams, 108 other teams from 14 different countries played in Girls 13. They were divided into 18 different groups, whereof Önnereds HK 2 could be found in Group 2 together with Südbadischer HV, Eidsvold Turn 2, Rødekro-Aabenraa Håndbold, Dybbøl IU 1 and OV Helsingborg 1. Önnereds HK 2 continued to B-Play-off after reaching 4:th place in Group 2. In the playoff they made it to 1/8 Final, but lost it against BK Heid 1 with 11-17. In the Final, AEH Les Franqueses del Vallès won over BK Heid 1 and became the winner of B-Play-off in Girls 13. Önnereds HK also participated in Girls 12 during Partille Cup 2018. They reached the 1/16 Final in G12 A-Play-off, but lost it against Alingsås HK 2 with 9-15.