Suzuhara Lulu, Sephira Su, Kamishiro Kurea, are drawn by the same illustrator, Saine. 
So they are called Saine sisters.
(EDIT) 0:10, her name is NOT Sephira RU, but Sephira SU (as in the thumbnail). Sorry about that.
【Original video】 https://youtu.be/NPFpIa4zKMg

【Suzuhara Lulu】 → https://www.youtube.com/channel/UC_a1ZYZ8ZTXpjg9xUY9sj8w

【Kamishiro Kurea】 → https://www.youtube.com/channel/UCBQd84IW8OvM8H5jftHdvmw

【Sephira Su】 →https://www.youtube.com/channel/UCHKJMmZJjLpkjZDPp_miSzg

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