Netto's father, Yuuichirou Hikari, unveils a groundbreaking invention called 'synchro chips', enabling operators and their navis to merge through 'cross fusion' within dimensional areas. Despite Misaki Gorou's failed attempt as the initial test subject, Netto volunteers Rockman for the risky procedure. However, Yuuichirou adamantly prohibits Netto from partaking due to the life-threatening consequences of Cross Fusion, which poses severe health risks and even mortality in real-world battles.