Define costume play heart in simple terms. Costume play refers to dressing up and pretending to be a particular character from a manga. This trend has immensely popular among fans of nerd subculture around the world. People diligently design costumes and props that accurately reflect their favorite characters. Costume players often attend events or costume play events, where they can display their artistry and meet others who share the same passion. In the end, cosplay is an manifestation of admiration and dedication for the fictional character and the love for the nerd community.