Hikaru has accepted a sparring invitation from Prince Viron. They move to a more secluded place to avoid any casualties from beachgoers who may be affected by their fight. Hikaru also doesn't want his fight to be watched by many people. Princess Rinne agreed to Hikaru's request and asked the soldiers guarding the beach to find a quiet place and asked them to be on guard so that no visitors would approach the battlefield.
Right now, Hikaru and the others were in a field that was quite a distance from where they were before. They couldn't find a quiet spot in the beach area, so they decided to look elsewhere.
Ziel, Clara, and the other girls also went to that place. They went to that place because Clara and Princess Iris were worried about Kyouka. Ziel had no idea since when they had become that close to her. Ziel could not help but have to obey her.