Da Capo 2 Nanaka Confession

Nanaka calls our protagonist and asks him to meet her under the Everlasting Cherry Tree.
And then Yoshiyuki nearly died that day. So, does this mark the start of her route? Probably just marks the split between the common route and band route.

Through an unbearably painful route of ignorance for our protagonist, he finally comes to realize a few complexities of his relationship with Koko after getting .