Oedo, and the Immortal Gem

Oedo, and the Immortal Gem (オエド、そして不死の宝玉) is the ninth episode of the In Another World With My Smartphone anime.

Plot
Touya'a group has arrived in Eashen. Leen reveals that she seeks the Niruya Ruins, but doesn't know where it is. Yae believes her father may know more, prompting Leen to insist they visit Yae's home. Elze doesn't like Leen's bossy attitude. Yae leads them to Oedo.

Touya asks if a king is in charge of Eashen. Yae explains that each region had a lord who served under the King. Hearing the name of Oedo's lord is Ieyahsu, Touya muses God "copied and pasted" Japan into this world. Linze, Elze, and Yumina are confused by the culture. Touya quickly explains geta shoes and palanquins, surprising Yae that he is so knowledgeable. Yae notices the mood in Odeo is off.

The group arrives at the Kokonoe home, where Yae is happily greeted by the housekeeper Ayane. They next meet Yae's mother Nanae Kokonoe, who wonders who the group is; Yae introduces them as her comrades who have helped her in the far west. Yae inquires about her father, whom Nanae explains is in battle with Ieyahsu; the Takada clan is invading. Even Yae's brother Jutaro is fighting. Yae realizes that this is why Oedo seemed off. Leen wonders about the situation, to which only rumors that the Takada clan will soon overtake the fortress have been heard. Yae quickly asks Touya to use [Recall] and [Gate] to get them there.

The group arrives on a hill, a safe distance away from the fortress. Touya uses his information on Jutaro to confirm he's safe for now. Leen keeps Yae from jumping into the battle. Touya offers to use [Long Sense] to find safe spots to jump to with [Gate] to get them into the fortress; he'll first go alone to ensure its safety. Touya's first jump takes him to just outside the battlefield, where he sees the Takada warriors shambling forward no matter how much they get hurt; he quickly guesses they're zombies.

In the fortress, Touya arrives; however, he is greeted by Jutaro's blade. Touya conducts introductions and explains Yae is back in Eashen. He opens a [Gate], bringing everyone to the fortress. Jutaro wonders who the other girls are, to which Yae explains they are her comrades. Yae wonders about their father, to which Jutaro assures her he is okay. Seeing the wounded, Touya uses [Program] to upgrade the [Multiple] spells on his phone; he uses [Cure Heal] to repair them. Touya warns that the blood the men lost hasn't been returned, so they healed and should take it easy. Touya inquires about the enemy, who only stop when their masks are broken. Leen guesses the masks are artifacts, believing Touya's phone is one. Touya quickly uses [Multiple] to rain down [Shining Javelin] on the undead warriors, destroying them. Yumina, Elze, Linze, and Yae are again impressed with Touya.

Later, the group meets with Yae's father, Jubei, and lord Tokugawa. Jubei is impressed with Yae for guarding a princess. Tokugawa asks who saved the fortress, to which Yumina reveals it was her betrothed Touya. Touya tries to protest her again, calling him her fiancee, but Yumina gives him the "kicked puppy" look to stop him. Yae and Elze look irritated, while Linze smiles with dead eyes; Leen grins at Touya's torment. Touya quickly asks why the Takeda clan is attacking. There are rumors that lord Tadeka Schingen is dead, and the dark mage strategist Yamamoto Kansukay is using his name. Leen guesses Kansukay is using an artifact, given the army of undead is quite large. Capturing Kansukay should calm things down.

A ninja named Tsubaki appears, revealing a letter from Kousaka Masanobu of the Elite Four under Schingen; it turns out the theory is correct. The letter asks for help rescuing the other three Elite Four members so they may take down Kansukay. Tsubaki reveals Kousaka has been feigning loyalty to buy time. Touya offers to help. Remembering Leen made her wings invisible, Touya wonders if she can do that to other people; she confirms this is the case. Touya decides to infiltrate Leen and Tsubaki. Elze points out that it's broad daylight, while Yae wishes to tell her mother Jubei and Jutaro are okay, and Yumina and Linze wish to bring food from the mansion to help aid the soldiers; Touya agrees to help with each idea. Touya uses [Recall] on Tsubaki, much to the ire of the girls.

At Nighttime, Touya, Leen, and Tsubaki they have arrived outside the compound. Leen makes herself and Touya invisible; bright side, those under the spell can see each other. Touya tries using [Gate] to get it, but it doesn't work; Leen suspects a magic barrier is in place. This means they'll have to get in an old-fashioned way. Tsubaki offers to destroy the source of the barrier, only for Leen to advise against it as it would alert Kansukay. Touya agrees they should follow Tsubaki in, closing his [Gate]. He sees Leen groping Tsubaki's breasts, though Leen claims Touya is doing it. Touya quickly shouts he hasn't moved. Tsubaki protests, but soon gets into it, with Leen noting her breasts are actually bigger than they appear. Touya chops Leen on the head, allowing Tsubaki to get free. Catching her breath, Tsubaki calls Touya mean. Touya quickly scolds Leen for misbehaving during a serious situation; he worries if they can succeed.

They sneak into the dungeon, freeing the three captives Elite Four. Touya uses [Modeling] to bend open the cells. Touya tries finding Kansukay, but the barrier blocks his [Search]; Leen informs him that the talisman powering the barrier must first be destroyed. It turns out it's just past the armory. They quickly see an unlit lantern giving off a dark aura; Leen confirms destroying it will destroy the barrier. Touya blasts it apart with Brunhild. Using the same [Multiple]/[Shining Javelin] combo, Touya takes out all the undead soldiers.

They confront Kansukay via [Gate]. Attempting to strike him calls forth an undead warrior, whom Baba Nobuharu identifies as the lord Schingen. Kansukay laughs that their loyalty will prevent them from cutting down their undead lord, only for Touya to quickly headshot the zombie and break the mask, animating him. Touya tells the confused Eashens that it's not like he owed Schingen any favors; the trio becomes embarrassed because it was so easy. Kansukay pulls off his eyepatch to reveal a red jewel, which he calls the Gem of Immortality, that keeps him alive and creates zombies. Touya simply, the gem, letting Leen examine it. She explains it corrupts the heart of its owner, deeming it useless; Leen tosses it into the air, where Touya shoots the Gem to pieces. Kansukay withers to dust; the gem was sucking him dry of mana and was the only thing keeping him alive.

The next day, Baba hears about Leen's wish to find the Niryu ruins. He knows where they are, but the ruins are at the bottom of the ocean. Baba explains he went to an island near the ruins, which Leen deems good enough. On her prompting, Touya uses [Recall] on Baba to see the location.

Later Touya regrouped with Yumina, Linze, Elze, Lee, and Yae at the Kokonoe home. Yae bids her family farewell. Jubei tells Touya he will repay the debt he owes him for helping resolve the incident; Touya turns down the offer. He opens a [Gate] to a beach, where the girls are in awe of the beautiful sea.

Characters

 * Touya Mochizuki
 * Linze Silhoueska
 * Elze Silhoueska
 * Yae Kokonoe
 * Yumina Ernea Belfast
 * Kohaku
 * Paula
 * Leen
 * Jutaro Kokonoe
 * Tokugawa Ieyasu
 * Tsubaki
 * Baba Nobuharu
 * Takeda Shingen
 * Yamamoto Kansuke

Spells Used

 * Shining Javelin
 * Banish Spell

Notable Places

 * Oedo, Eashen

Media Counterpart
Footnote: &dagger; - Partially Nonexistent - 50% or more storyline is missing.

Trivia

 * This was actually the first time one of the artifacts from the Storehouse of Babylon caused a headache for Touya to clean up.