"I ♥" (read as "I Heart") is a Vocaloid song by producer Junky, featuring Kagamine Rin (鏡音リン). Originally uploaded to Nico Nico Douga with an original PV, it was added to maimai on January 23, 2014 as part of the GreeN version, falling under the niconico & Vocaloid (niconico＆ボーカロイド) genre category. The song sits at a moderate 132 BPM and has been a staple of the maimai arcade song library across regions including Japan, international, USA, and China. Junky is a Vocaloid producer known for upbeat, melodic compositions frequently featuring Kagamine Rin/Len. "I ♥" stands out among his early works for its simple, affectionate title rendered with a heart symbol rather than the word "love." Over the course of maimai's version history, the chart difficulty levels for "I ♥" have been adjusted multiple times, the Expert chart, for instance, started at level 8 in GreeN and was eventually raised to level 9 by the UNiVERSE+ era, while the Master chart climbed from its original level 10 to its current 12+ (12.7 constant) by the FESTiVAL version onward. The Expert chart was designed by はっぴー, while the Master chart was crafted by the maimai TEAM, whose design approach gives the 12+ chart a notably dense 509-note layout at 132 BPM.