Fight Ippatsu! Juuden-chan!!

Synopsis

Arresta tries her best to recharge Sento, but to no avail. Plug meanwhile is shocked to find Kenta has returned to a B rank. Hakone and Iono arrive and manage to get Sento out of their funk on their own. Plug tries to charge Kenta, but despite the excruciating pain, she does not succeed, and he starts to walk into the river. Arresta uses a spark trail to lead Sento to where Plug is, and he manages to save Kenta. He tells him about the Jūden-chan, lifting his spirits. Plug's unit arrives, and combines their plugs to form a giant plug to charge Kenta. Sento absorbs some of the excess electricity and regains his ability to see Jūden-chan, letting Plug and Arresta completely charge Kenta. Rona tries to attack them, but has some sense knocked into her by Sento. Everyone then spends Christmas Day together.

(Source: Wikipedia)