If you're looking for manga similar to 100% Pascal-sensei (2017), you might like these titles.
A sloppily worn lab coat, lifeless eyes just like a dead fish's. He's the most un-teacher-like high school teacher, Sakata Ginpachi. The class he's in charge of, 3Z, is filled with 'intensive' students who have created a horrifying amusement park.
Senior high schooler Hikaru Umino is desperately in love with his teacher, Kuniaki Shima. When he hears a rumor that Shima is engaged to be married, Hikaru does the unthinkable and forces himself on his teacher. Shima makes him atone for his sin by, unexpectedly, becoming “make-believe” lovers until Hikaru graduates high school. When the time limit expires, can Hikaru let go of his beloved teacher?
Murooka is an elementary school teacher who carries a secret: He likes little boys, and not in an othodox way! Because of this he must wear a "mask" to hide his motives. But what happens when a temporary teacher with the body of a school boy starts working at the same school? Will Murooka finally find love? And how will he deal with the beautiful female teacher who begins to fall for him? Not to mention when his first crush and uncle of his favorite student volunteers to help with the school play. Will Murooka ever find peace?