The Cunning Older Sister Victims' Association

A strange tea party held at a certain duke's mansion. "That's so unfair!" "Seriously... it's incredibly unfair! How can such a terrible thing happen?" "Miss Luminous... Ah, how unfair that person is. I can't forgive her!!" Gathered there were the members of the self-proclaimed "Victims of Unfair Big Sister Club." ...Thus, this is a comedy that twists the otherworldly romance template. As always, it's a story that's "true to the title but not true to the title." ※Just to be safe, I've added the Girls' Love tag, but there are no kisses, hugs, or even hand-holding. They just say "Big Sister..." ※Also posted on Kakuyomu