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"At 16 years old, Makino Yayoi is a high school girl who pledged to her mother that she would abstain from having sex until she reached 20. She fears that this vow is under threat, mistakenly believing that her classmate, Suzuki, is determined to take her virginity. In a bid to protect herself, she resorts to using all her skills and tactics to defend her chastity at all costs."
<https://novamanga.com/read/bousou-shojo-chapter-66>