Isekai Quartet 異世界かるてっと

Alternative Name: 异世界四重奏 (Yì Shì Jiè Sì Chóng Zòu)

Genre: Comedy, Parody, Fantasy, Isekai, Alternative Version I, 

               Alternative Version II, Alternative Version III, 

               Alternative Version IV

Description: 

A mysterious switch appeared one day. Upon pressing it, they were sent to a different alternative world!! There are also characters from other alternative worlds gathered together...!?

Episode: 12 + 4 Special + 12 + 1 Movie

Original Run

Season 1: April 10, 2019 – June 26, 2019
Special: October 27, 2018 – March 8, 2019

Season 2: January 15, 2020 – April 1, 2020

Movie: Scheduled to be on aired 2022

Studio: Studio PuYUKAI

List of Songs (directly to CrimNight Muse Garden)

1. Isekai Quartet                                      [Opening]

2. Isekai Girls♡Talk                           [First Ending]

3. Hollow Veil                                   [Second Ending]

Season 2: 
1. Isekai Showtime                                   [Opening]
2. Ponkotsu! Isekai Theater             [First Ending]
3. Sweet Pass                                        [Second Ending]

Here is the preview: