“Midsummer Night's Erotic Dream, 114514” is an extremely famous combination used in Japanese internet memes (primarily on Nico Nico Douga, 5ch, and Pixiv). 1. What is “Midsummer Night's Erotic Dream”? • Original source: The gay adult video “Babylon STAGE 34: Midsummer Night's Erotic Dream ~the IMP~” (an anthology series consisting of 4 chapters). • Chapter 4, “Rape While Unconscious! The Senior Who Turned Into a Beast,” became explosively famous. • The eccentric acting, expressions, and lines of one of the performers (commonly known as “Beast Senpai”) were extensively excerpted in MAD videos on Niconico Douga, leading to a massive breakout in popularity from the late 2000s through the 2010s. • It remains a staple meme today as “Erotic Dream Quotes” and “Beast Senpai.” 2. What is “114514”? • A pun on the phrase “It’s okay! Come on!” (114514 → ii (11) yo (4) ko (5) i (1) yo (4)). • Original line: A scene where Beast Senpai pleads, “It’s okay, come on! On my chest, right on my chest!" • In other words, it’s an Inmu quote meaning “It’s okay to ejaculate (on me), come on!” • In the Inmu community, it’s a super-standard number on par with 810 (Yajuu), and is used to hide inside jokes while making it look like just a random number (e.g., 114514 points, 114514 times, etc.).