18-Sai no Himitsu

With only two months left of high school, Sako is quite frustrated. After breaking up with her previous boyfriend during her first year, she ended up discussing her love life with the handsome Shiraishi-sensei, and fell in love with his kindness. She partially regrets having no love-life to speak of for those three years, but rather than anyone she wants to be special to Shiraishi-sensei, even if it is something as small as sharing a tiny secret.