Hearts Day, a special day celebrated in the East every year, where girls confess their feelings to their person of interest. Most of Aldo's female companions are interested in the event.

Cetie only planned to take Renri for a little snack vacation, and Aldo should've been only searching for information regarding it to a certain sweet-tooth samurai girl. None of them expected it to turn out into a double-pair event. Aldo/Azami, Cetie/Renri.