What If I Time-travelled to 1981 and Became Kayako's Classmate?

【Non-fanfiction】+【Light novel】+【Original fantasy】+【Supernatural】

When he woke up, Luo You found himself a freshman in Japan in 1981.

Luo You, who had been absent for a month due to a traffic accident, officially returned to school and activated the system that allowed him to get rewards by improving his favorability.

But the name of the object seems a little familiar, something like "Kawamayaka Coconut".