One day, a magic button suddenly appears. The protagonists in KonoSuba, Overlord, Re:Zero − Starting Life in Another World, and The Saga of Tanya the Evil all press the button and move to a parallel world — another brand new isekai — where a new story featuring high school life begins.
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Episode 9;

This has quickly become one of my favorite anime this season. It's a bummer each episode lasts only 10 minutes

Last episode was great. Ains being impressed by Subaru's mental fortitude, as well as recognizing Tanya's magical prowess. This show does a great job combining these 4 actually totally different anime