Spring, Summer, And Winter Have Been Cursed!

Hagiyoshi Tamaki, a member of the school's occult club, decides to summon the 'Jet Black Witch' to bring despair to the ignorant masses of the world. Her fellow members in the occult club think she's suffering from Chuunibyou (middle-school syndrome), but agree to help with the summoning.

In the middle of the ritual, a mysterious girl dressed in black appears…