Ocean planted a Cherry Blossom tree in Sensei's room and it finally grew into a big, big tree.
She made up a thing from her anime games and shows. Except with some weirdness.

'Hey all of you weirdos! Do you want your crush to accept you? To you want to die? Well then come to OCEAN'S CHERRY TREE. If to make your crush love you, make them come to the god damn tree!
If you want to die, please put some of your blood into a vile so we can remember you.

Signed
OCEAN'

She of course framed it by the tree.
Most of the Ninja did not believe it but Kaleb did (mostly because of the death)