Ghosts at School

Gakkou no Kaidan (学校の怪談, lit. "Ghosts at School") is an anime that aired Oct 22, 2000 to Aug 24, 2001.

Plot
Kids and ghosts. When young Satsuki finds an old book of spells from her passed away mother, she gains the power to fight ghosts that are haunting her new school. With the help of her friends, and of a really wicked devil cat, she must protect everyone around her or be haunted for ever more.