I Grow the Tech Tree by Transmigrating into a Book

Whether it's a magical world, a historical dynasty, a second-dimensional universe, or a futuristic galaxy, if you dare write it, I'll make you transmigrate into a book :D After Yan Shu was accepted into the Comprehensive National Defense University, the nightmares of its students began :D University Forum - [Anonymous]: I was such a fool. I knew Yan Shu, our junior, could use her ability to play full-dive games, but I never thought the devil professors could come up with a new way to torment us, like a calculus nightmare... [Burly Man Crying.jpg] Attention, new students! Don't fail your courses! Don't fail your courses!! Especially don't fail calculus, or once you're inside a full-dive calculus textbook, calculus will kill you!!! Yan Shu, a new student in the 84th class at Comprehensive National Defense University. Her ability lets people enter books (= manually transmigrate into a book). Please note: 1. The worlds inside the books vary widely, and most are original settings. 2. The main plot is about advancing the tech tree. The nation is the love interest, and there may not be a CP. 3. [I'm very unhappy with this book. I don't recommend reading it.] [Next book] [The Intelligence Division Girl Wants to Fall in Love Too] Shiusu Tsuzuki can use mirrors to see what other people are doing. When Dazai goes missing and is captured by the Port Mafia, she uses her mirrors to search for him, only to see Chuuya Nakahara, a Port Mafia executive, beating Dazai to a pulp. Shiusu Tsuzuki, watching in the mirror: ! Who is that?! He's so cute! The way he beats up Dazai is so cool! It was love at first sight!!! Later - Shiusu Tsuzuki: President! Let's arrange a marriage alliance with the Port Mafia! I want to marry that 160-centimeter gravity user over there! Captured Big Sis Kouyou: ? You didn't just abduct my Kyouka, now you want to go after Chuuya too?! Theme: Strengthen the nation through science and technology