I GUESS I BECAME THE MOTHER OF THE GREAT DEMON KING'S 10 CHILDREN IN ANOTHER WORLD #6

Akari, a high school girl, lost her mother, who was the only family she had, in a freak accident. She is summoned to the Zodia Empire, a foreign world that is home to demons, where she is told that she will bear the children of the Archfiend, King Gran! She is a virgin, but thanks to cheat items, she gives birth to five children! She also succeeds in rescuing the Demon King's mother, Dernière, who was being held captive in Soleil, the Land of Humans, who are at war with the demons. Dernière's missing husband, Shinichiro, is also a human. Together with Dernière, Akari, Gran and their children climb the World Tree in search of him and at the top find El Dorado, the Land of Celestials. However, their Queen, Ciel, is actually bored of peace and enjoys the all-out war between demons and humans! As Gran tries to save Akari from Ciel, a World Tree flower starts glowing and their sixth child is born. But then Akari gets sent back to her world with the baby...! — Description from Comic Vine community (comicvine.gamespot.com).