Coming in second is the summer school uniform of Nijigasaki Academy from the Love Live! Nijigasaki High School Idol Club series.
The school uniform of Otonokizaka Academy from the Love Live! series, which dominated the ranking for two consecutive years from 2014 to 2015, returned to the top.
Meanwhile, the summer school uniform of Uranohoshi Girls’ Academy from another Love Live! series, Love Live! Sunshine!!, failed to rank in the top 10 last year (it was the most popular costume in 2017).