I personally don't like "Guarding Sweetheart", but unexpectedly, I particularly like Fujisaki Naghiko. I can't help it, who makes me a transvestite and a sinister. The heroine won't be very sexy, but maybe a little bit.
The song is a bit sad at the beginning, but it gets better gradually, so please don't worry if you like the song.
As for Ya Meng, I really don't like her. At most, I just know her, and I won't turn Ya Meng into a bad person. If my classmates who like Ya Meng really don't like her, it's better not to read it.