Ichiban means “number one”.

Himitsu means “secret”.

Don’t ask me why they are yelling “secret”.

=================EDIT BY CHOMPY==============

Chompy: The first fangirl is Sheela, our gracious host and the second one is Hazel, the Mirror-Man cosplayer (real ichiban – Aiba). I forgot who Sheela’s Ichiban was, so L had to change the names. The guy in the third panel is Jake. πŸ˜€ For the record, my ichiban is Jun, niban is Sho. But its a close fight. Andrea and Glen represent my two favorites. I think Lyndon likes Nino. πŸ˜€

Thanks to the explanation of arashiwantsme and Ria about the “secret”. Here it is for your viewing pleasure: