There could be a plot where Izuku needs to disguise as a girl to avoid some villains. The villains might be looking for a male hero, so by dressing like a girl, Izuku can move around freely and gather intelligence on the villains without being detected.
He might do it for a bet. Just like some friends might bet on who can pull off a crazy stunt, his friends could have bet him that he can't dress like a girl and act the part for a certain period.
It could be part of a role - playing game within the fanfiction world. For example, if there is a new RPG - like event at school where students take on different roles, Izuku might choose to be a female character for a unique experience and to challenge himself.
The best chapter pointer here is Chapter 95, "The Problem Lies with Your Boyfriend". It opens with Hearing others praise her daughter, Aunt Lin was smiling so wide she... and closes on Your boyfriend must have studied in another province, if I'm not mistaken,....
Look to Chapter 114 for the clearest answer. It begins with As time passed, the number of viewers in the live broadcast gradually..., keeps building through After a whole day of trending searches yesterday, the popularity of..., and lands on But just now, an uncle came and said not to give you.
A practical answer is Chapter 112, because it turns the idea into a concrete scene. The chapter opens with These five people are supposed to be at odds., adds pressure through Do you remember that bowl of Mushroom Soup?" Jiang Li smiled, "Your..., and ends on [Hahahaha why is the Princess starting.
Look to Chapter 65 for the clearest answer. It begins with Several minutes later, the room remained silent., keeps building through The cameraman then discovered that Jiang Li's door wasn't properly shut,..., and lands on What's the deal with these two?.
If you want the clearest chapter reference, go to Chapter 146. Early on, Director Sun: "???" Jiang Li smiled and said, "In the past, the show crew...; later, the chapter leans on But most of the dishes tonight are made by the villagers..
Look to Chapter 98 for the clearest answer. It begins with Jiang Li listened to the end and didn't have much of a reaction, only..., keeps building through Each script is more far-fetched than the next.] [Exactly, doesn't anyone..., and lands on That's why she's not scared.]] Everyone held their.
Chapter 101 is the strongest chapter-level answer because it starts from Jiang Li walked over to the slope where the two had fallen down. and follows through on If you encounter any trouble in the future, you can come to me.. The payoff is that the chapter closes with Could it be...
The best chapter pointer here is Chapter 121, "Jiang Li Gains 5 Points for His Meritorious Rescue!". It opens with Seeing that Wen Jiaojiao's condition had improved significantly, Director... and closes on You're supposed to be a man who conquers mountains!] Experienced and....
Chapter 95 is the strongest chapter-level answer because it starts from Hearing others praise her daughter, Aunt Lin was smiling so wide she... and follows through on Your boyfriend must have studied in another province, if I'm not mistaken,....
Look to Chapter 85 for the clearest answer. It begins with Facing everyone's skepticism and curiosity, Jiang Li explained fluently:..., keeps building through The tomatoes are grown by them, and the eggs are also from their..., and lands on This fresh and vibrant flavor blended perfectly..