Little Battlers eXperience S03 E01 The Day we Arrived on the Battlefield

Arata Sena finally arrives and leaves a boat and accompanies Hikaru Hoshihara towards Kamui Daimon Comprehensive Academy. They are later introduced to the class by Reina Mito and is led towards the shocking Second World underground. Haruki Izumo then arrives and gives the two a temporary LBX and they start a match on the underground LBX battlefield.