Mikami-sensei's Way of Love Vol. 3 (Kodansha, 2019)

Mikami-sensei and Natsume continue to maintain their overprotective relationship at school, but carry on as lovers in secret! But lately, Mikami-sensei's affections have been growing in intensity whenever the two find themselves alone … And on the night of their school field trip, something happens that brings their relationship to a whole new level … ! A thrilling overnight outing filled with love awaits ...