The 4th installment of the school series that follows a cute girl who loves to be licked. 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 and masochistic girl who usually shows a mischievous smile but shyly talks about naughty things. The most important thing as a teacher is the ambition to pursue naughty things. Serina-chan, who has recently become more fun with blowjobs, is full of talent!!