723NNG-004 The 4th installment of a school series that follows a cute girl who loves to be licked and her lessons. Attendance number 037 Serina-chan who transferred from an ordinary preparatory school this time. She is a serious and smart honor student type, and she is a sensitive girl who usually shows a mischievous smile but speaks shyly about naughty things. What she thinks most important as a teacher is the ambition to pursue naughty things. Serina-chan, who recently said that fellatio has become fun, is full of talent!! There is a huge cock fellatio, there is a vaginal cum shot, and now is the time to enter the academy!