Greetings everyone , as the title says i need some help finding a shounen manga that was about a high school guy living in a town that is going to soon to be used to film a drama adaptation of a famous novel and he (just like all any other mangas) finds the female protagonist roaming the town and falls in love at first sight but then the girls needs his help since she have never had a boyfriend before and the characther that she is going to act is about a girl falling in love , going on dates yadayadayada and then when the other girls appers fight on the love triangle .
Also there was something about being autumn or about a certain type of tree with a special looking leaves or something like that , i will be very grateful if you could help me find it , thanks

Koisome Momiji?

Yep that is the the one , thank you