Based off the previous comics I'd say asashio was going to say something like "I love TTK" or something and the "lie would be the "I'm going to tell a lie" bit but the TTK saw through her plan.
Awkward...April Fool's VS AsashioADMIRALToday, I, Asashio, shall tell a fib!Commander! It's April 1st today, isn't it!That there was also a lie.