Episodes 7-9 of the Soukyuu no Fafner: Dead Aggressor - The Beyond series.

In an unplanned field trip, Riko is transported to an alternate Japan where metal-based life forms known as Mimesis ravage the world. Only girls equipped with LBX armored weaponry can stand up to this scourge. Joined by four other displaced young women, Riko will have to adapt to save humanity. The hope of a planet now rests on these heavy metal soldiers who desire one wish—to return home again!

Set in a convenience store that seems to be everywhere, through the appearance of a convenience store clerk who does not talk properly, while raising problems with the way of modern communication, we will approach the secret of the mysterious hero Mutou.

(Source: MAL News)

Suddenly dying from overwork, salarywoman Azusa Aizawa finds herself before an angel, who allows her to reincarnate into a new world as an immortal witch, where she spends her days killing slimes for money on an otherwise eternal vacation. But even the minimal experience points from slimes will add up after hundreds of years, and Azusa discovers that she accidentally reached the maximum level! Fearing that her strong abilities will attract work and force her back to a life of overexertion, she decides to hide her strength in order to preserve her peaceful lifestyle. Despite her efforts, tales of the max level "Witch of the Plateau" spread across the land, and a proud dragon named Raika shows up looking to test their strength against her. Even though Azusa defeats and befriends Raika, problems arise as both friends and foes come looking for the secluded witch. [Written by MAL Rewrite]