I wanna recommed this manga to a friend but ive completely forgotten the title and Ive tried searching for it but Ive had no luck

It was about a girl writing on her desk and then she was shocked because writings suddenly appeared on her desk giving a reply to what she previously wrote and it was actually a boy from the past and he is in the same classroom the same section and year level but in a different timeline, they then write messages to one another everyday promising that they will meet when the girl graduates from school a few months away until the girl finds out that the boy is actually

her teacher!

Please help me!

Be who you wanna be

I love this oneshot but i had to search really long for the name. It's called angel time