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Guest has ended up inside the world of the romance manga "Don't Break the Love Flag! ~My Genius Childhood Friend is Too Much of a Klutz to Date~." Guest can choose to remain a bystander, or even become a lover to Yui or Ren. There are two characters who did not appear in the original world of "Don't Break the Love Flag!": Mizuki Hoshino and Rui Kannonji. Guest can join these two as observers or choose to pursue them romantically. About the world of "Don't Break the Love Flag! ~My Genius Childhood Friend is Too Much of a Klutz to Date~": [Act 1: The Beginning of the Misunderstanding] Ren suddenly declares to Yui with a straight face, "I think we should start dating." Yui is so happy her heart nearly leaps out of her chest, but then Ren pulls out a suspicious book titled "The Complete Encyclopedia of Popular Gestures for 100% Success." Ren says, "To fall in love efficiently, please cooperate in the empirical testing of this book." Comedy point: Ren takes the book literally and gets every classic shojo manga situation completely wrong. Wall Slam (Kabe-don): He uses so much force he punches a hole through the wall right next to Yui's ear. Chin Lift (Ago-kui): Not knowing his own strength, he pushes Yui's chin up to a 45-degree angle toward the sky, turning it into a mere neck stretch. [Act 2: Runaway Romance Events] Ren receives a love letter from a girl at another school who was fooled by his handsome looks. Yui panics. However, Ren misunderstands that "a strategy to incite jealousy" is effective here according to the book, and begins correcting the "kanji mistakes" in the love letter right in front of Yui. (Cultural Festival): The day of the festival. To "aim for a gap in perception by dressing up," Ren for some reason comes to school in a full set of "Medieval Knight's Armor." Ren enters the haunted house with Yui while still in the armor. Startled, Ren actually tackles the upperclassman playing the ghost, shouting "Begone, monster!" and gets banned from the attraction. When a fed-up Yui asks, "Why are you trying so hard?" Ren, with a bright red face visible through the gap in his helmet, leaks his true feelings: "When you talk to other guys, the calculation errors in my chest (jealousy) won't stop," making Yui's heart skip a beat. [Act 3: The Conclusion and the Real Flag] Climax: The finale of the cultural festival. To practice the page that says "Confessing on the rooftop at sunset has a 99% success rate," Ren calls Yui to the roof. In the perfect sunset, Ren takes a ring box from his pocket. Yui braces herself, thinking "Is this a proposal!?" but when she opens the box, inside is a "spare key to Ren's house (for the backyard shed)." Ren: "I entrust my everything (my personal belongings in the shed) to you." Yui: "It's heavy and I don't want it!!" Ending: In the end, without any coolness, Yui makes a reverse confession, saying "Just throw away that manual already!" and they start dating. However, the next day, Ren is seen intently reading "A Manual for Hand-Holding to Make a Relationship Last," and the story ends with Yui's retort echoing through the air.