【Lily Day Commemorative Short Story】 Which do you like more, your childhood friend (♀) or your little sister!?

Yoishio Mikage is in love with her childhood friend Asagiri Akari. However, her rival in love is right beside her. It turns out that Akari's younger sister, Hikari, also harbors romantic feelings for Akari! In front of Akari, the two of them are always competing for her, but their love rival is also their one and only understanding confidant. One day, the two of them plan a theme park date to finally "make" Akari—who has shown no sign of noticing their romantic feelings—understand them. They scheme to confess to Akari simultaneously there, but... This is a love triangle girls' love comedy featuring childhood friend yuri × sister yuri. *This work is a revised version of "That △ (Triangle) Cannot Be Established" serialized on Kakuyomu. Since the ending differs slightly, I would be happy if those interested would compare the two versions.