The Skies of Aquaria - S2.E12

The Elements mourn the deaths of Jin and the other students who perished in the previous battle. After their funeral, Fudo orders Andy to dig graves for all the remaining pilots to be buried alive as part of a special training. Mikono refuses to take part in the training, but when she feels her friends' lives in danger, she helps them by activating her own elemental power of connection.