Why would you want to serialized? You KNOW what will happen.
introduction: super serious teacher strict with anyone but dead on the inside, bonus if there is a friendly female colleague that makes him notice he won't ever make friends if he keeps acting like that.
Notices Gal wearing sloppy dress, she teases him, tells him if he wants to look at her or grope her out of nowhere
repeat the formula of "perverted gal who is also a virgin that teases and embarasses him, with occasional ecchi" for....20 chapters
flashback to her as a young girl, connection with him, maybe he was kind with her one time.
He slowly realizes his feelings.
Big Timeskip: waiting for her to become adult or he is getting transferred, or she is getting transferred.
they meet again, hug, the end.
Boring, the writer should have set it in university.
But if you really must then read something like Kuro Gal-san ga Kuru!