A Sign, Mei Aihara and Spicy Food is the Omake of Volume 6 of the Citrus manga. It was released on December 17th, 2016.
Harumi and Mitsuko are washing dishes after dinner as there do Harumi tell's Mitsuko that today's hotpot was good, as she leaves Mitsuko was touched on what she said.
Mei Aihara and Spicy Food
Mei buys spicy curry in an attempt to enjoy Yuzu's taste in food. This leaves Himeko confused and worried, knowing of Mei's dislike towards spicy foods. After reluctantly eating the spicy curry, Himeko pleads for her to stop, but realizes why Mei is eating it when Yuzu makes a comment on how good it is. This provokes Himeko to try the spicy curry as a way to get closer to Mei.