Change of Heart

Change of Heart is the seventh episode of the How NOT to Summon a Demon Lord series. It aired on August 16, 2018.

Synopsis
''Using a special manipulative magic, Keera kidnaps Shera and holds her hostage all under the pretense that she wants to return home. Depressed over the fact that Shera chose her home over him, Diablo is convinced by Rem to go after her.''

Plot
Diablo has a dream of his childhood, where two kids he thought were his friends were just using him for stronger equipment in a game. Awakening from the dream, Diablo finds himself in a predicament in bed.

Afterward, Rem leaves with Alicia to respectively report to Celes and Galford about their encounter with Keera. Alone with Shera, Diablo starts create potions in preparation of the trials ahead of them. Astonishingly, Diablo is able to create potion merely by focusing on the task. During a heart to heart between Diablo and Shera, the sound of a flute being play could be heard. In a trance like state, Shera details that she wants to return to her home of the Kingdom of Greenwood and then leaves on a wagon that Keera just so happened to be riding on. Left disconcerted, Rem and Alicia return to Diablo who informs the two that Shera has returned to the Kingdom of Greenwood. Wanting to know why, Diablo doesn't answer Rem's question and instead heads back into the inn and lays on his bed depressed over what happened.

Later that day, Rem joins Diablo in his room and tries to console him by talking about Shera. Asking if Shera could have been hypnotized by Keera, Diablo confirms it mentioning that when Keera arrived the sounds of his flute could be heard. Ruminating on his past naive mistakes in regards to what he considered people to be his friends were merely taking advantage of him. Adamant that she wants to get Shera back, Rem asks what Diablo's intentions are and after reflecting on it, he decides to get Shera back too. Alicia also volunteers to join them as well. Now with a full party, the group sets off to confront Keera.

Meanwhile, in a tent in the Kingdom of Greenwood, Shera now captured and chained to the wall, is told by her brother that it's futile to try and escape. This is due to the powers of the Elven Flute. Keera then interrogates Shera demanding to know what orders Diablo asked of her. Answering truthfully, Shera informs her brother how the only order she was ever given was to shake Rem's hand with a smile. Hearing this infuriates Keera as he doesn't believe such a simple order was given. Nonetheless, Keera is confident that he has Shera in his submission, but just then a giant explosion occurs from outside. Upset by this disturbance, Keera sets loose a fabric eating slime and said monster starts to entangle Shera and devour her clothing. Crying for help, Diablo accompanied by Rem and Alicia arrive to rescue the captured Shera. Seeing Shera's predicament, Diablo voices his regret in not dealing with Keera before even if it meant turning burning everything around him into cinders. He then uses his scythe to free Shera from her constrains, killing the slime in the process. Furious that his guards failed to do their job, Diablo points out that Keera failed to hear the noise from outside earlier.

Checking outside, Keera is astonished that not only his guards were defeated, but the surrounding area they were stationed in was set ablaze. Keera demands to know if Diablo wants to start a war with the Elves, however, Diablo's motives were to confirm if Shera truly wanted to return home under her own volition. When asked for proof, Keera asks Shera if she wants to return home or not. Under her brother's manipulative magic, Shera answers that does want to return home to the Kingdom of Greenwood. To counteract Keera's magic, Diablo uses Shera's slave collar to dispel the manipulation spell and Shera tearfully proclaims that she wants to be free and stay with Diablo and Rem forever. Backed into a corner, Keera summons the Elven Kingdom's treasure, the Hydra and intrepidly despite Shera's warning Diablo steps forth to face off against it.

Characters In Order of Appearance

 * Takuma Sakamoto/Diablo
 * Shera L. Greenwood
 * Rem Galleu
 * Alicia Crystella
 * Mei
 * Keera L. Greenwood
 * Celsior

Differences from the Light Novel

 * The flashback to Takuma Sakamoto’s childhood is not present.
 * The anime skips the battle between Diablo and his party against the Elves, only alluding to it from Shera and Keera’s perspective.
 * Keera thrashes his tent in a rage looking for the summon crystal of Force Hydra.