Online streaming sub anime shows:

Isekai Quartet sub
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Isekai Quartet is a crossover series featuring characters from popular “isekai” franchises illustrated in cute, superdeformed style.The button appeared out of nowhere. There weren't any signs NOT to push it...so the solution is obvious, right? Is it a trap or the start of something new and exciting? The crews of Re:Zero, Overlord, Konosuba, and The Saga of Tanya the Evil will find out when they go from their world to another and get stuck in...class?! See what adorable chaos they'll get up to in this collection of shorts!Source: funimation

Main title: Isekai Quartet
Official verified title in English: Isekai Quartet

Other unofficial verified titles:
異世界かるてっと in Japanese
Show type: TV Series, 12 episodes
On air: 10.04.2019 till ?
Tags: short episodes

We have 12 of 12 episodes!

Joshi Kausei sub
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Based on a comedy slice of life seinen manga by Wakai Ken.Who needs dialog when you're this cute? The beautiful (but unlucky) Momoko, the cool, collected Shibumi, and the refreshingly innocent Mayumi star in a silent manga. No speeches, no dialog! Just pictures, sound effects, and three high school girls living their daily lives.Source: crunchyroll

Main title: Joshi Kausei
Official verified title in English: Joshi Kausei

Other unofficial verified titles:
女子かう生 in Japanese

Synonyms: Joshikausei, Jyoshi Kausei
Show type: TV Series, unknown number of episodes
On air: 06.04.2019 till ?
Tags: high school, manga, school life, seinen, short episodes

We have 12 of 12 episodes!

Kenja no Mago sub
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Based on a light novel series written by Yoshioka Tsuyoshi and illustrated by Kikuchi Seiji.A young man dies in a car accident and is reborn in a magical new world. The old, yet wise Merlin finds the boy, names him Shin, raises him from infancy, and teaches him combat and powerful magic along the way. 15 years later, Shin is ready to travel the globe on his own, but Merlin forgot to teach him something major—common sense!Source: Funimation

Main title: Kenja no Mago
Official verified title in English: Wise Man`s Grandchild

Other unofficial verified titles:
賢者の孫 in Japanese
Show type: TV Series, 12 episodes
On air: 10.04.2019 till ?
Tags: fantasy, novel, parallel world

We have 12 of 12 episodes!

Kimetsu no Yaiba (Demon Slayer) sub
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Based on an action fantasy shounen manga by Gotouge Koyoharu.Since ancient times, rumors have abounded of man-eating demons lurking in the woods. Because of this, the local townsfolk never venture outside at night. Legend has it that a demon slayer also roams the night, hunting down these bloodthirsty demons. For young Tanjirou, these rumors will soon to become his harsh reality...Ever since the death of his father, Tanjirou has taken it upon himself to support his family. Although their lives may be hardened by tragedy, they've found happiness. But that ephemeral warmth is shattered one day when Tanjirou finds is family slaughtered and the lone survivor, his sister Nezuko, turned into a demon. To his surprise, however, Nezuko still shows signs of human emotion and thought... Thus begins Tanjirou's request to fight demons and turn his sister human again.Source: Viz Media

Main title: Kimetsu no Yaiba
Official verified title in English: Demon Slayer

Other unofficial verified titles:
鬼滅の刃 in Japanese
鬼滅之刃 in Chinese (Traditional)

Synonyms: Demon Slayer: Kimetsu no Yaiba
Show type: TV Series, unknown number of episodes
On air: 06.04.2019 till ?

We have 26 of 26 episodes!