Rune Venus is the princess of Roshtaria. She&#039;s both the leader of Roshtaria and the head of the Alliance. A serious, intelligent and kind-hearted ruler.     (by Wikipedia)

Makoto Mizuhara is working on his latest experiment in the school science lab, but when he takes a break his lifelong rival Katsuhiko Jinnai shows up and attempts to destroy the device and discredit Makoto. This overloads the experiment and transports Makoto, Jinnai, his sister Nanami, and their teacher Mr. Fujisawa to the strange and magnificent world El Hazard. Makoto and Fujisawa land squarely in the Kingdom of Roshtaria, and quickly befriend the princess Rune Venus. Jinnai allies himself with the Bugrom, a race of giant insects bent on taking over El Hazard, while his sister tries to eke out her own living in the desert. Makoto searches desperately for a way to return home, all the while fighting off the Bugrom, enlisting the help of the Holy Priestesses, and stopping the demon god Ifurita from destroying everything.
 
(Source: Anime News Network)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

When Makoto Mizuhara discovers an old monument in his school and awakens a beautiful woman, he, his teacher, his worst enemy and one of his female friends is transported to the magnificent world of El Hazard. There they discovers that they have received some special powers. Makoto and his teacher Fujisawa lands in a jungle and saves a princess from some large bugs. Makoto's friend Nanami lands in a desert. And Makoto's rival, Jinnai lands in the middle of the bug's kingdom and becomes their general, plotting to destroy Makoto and his new friends. After several having his attacks repelled by Makoto several times, Jinnai learns about an ultimate weapon, the demon Ifurita. And so everyone sets of to find Ifurita, and when she's found Makoto learns that she is the same woman that sent them to El Hazard. But the one gaining control of her is Jinnai.
 
(Source: Anime News Network)
 
Note: The first & last episode have a duration of ~46 minutes

A new Priestess of Water has arrived! Her name is Qawool Towles, and though she's only 17, everyone (except for Shayla-Shayla) welcomes her with open arms. But during her initiation ceremony, a mysterious entity named Arjah appears and transports them all to an alternate world! 
 
Now, Makoto and the others are stranded all over again in a strange new kingdom called Creteria. It's a bleak, industrial realm ruled by a despot named Dall. If they ever want to make it back to El-Hazard, they'll have to figure out the secret behind an ancient artifact called the Spring of Life. And they'd better do it fast, because the spring seems to be dying... 
 
(Source: Nozomi Entertainment)

Continuing the from OVAs; When Fujisawa, suffering from cold feet, leaves Miz at the altar, an enraged Priestess drafts Makoto and friends to go find him. In the couse of locating the hapless (and gutless) teacher, they find another Ifurita. Meanwhile Jinnai and Diva searching for a new Bugrom homeland stumble upon another yet another Demon God, the impish Kalia. However, unlike Ifurita she has a mind, and a mission, of her own...
 
(Source: Anime News Network)

Good-natured Makoto Mizuhara was liked by all&mdash;a fact that arrogant class president Jinnai could not abide. But that was before he met a strange woman in the depths of Shinonome High School and was whisked away to the even stranger world of El-Hazard! 
Along for the ride, Jinnai, his sister Nanami, and teacher Masamichi Fujisawa also join Makoto. While Makoto and company befriend the royal family of Roshtaria and the Muldoon Priestesses, Jinnai has allied himself with the seductive Deva, queen of the hive-like Bugrom Empire. The former Earthlings find themselves changed by their new environment as well and have developed strange supernatural powers. 
Now, with the fate of the kingdom Roshtaria and all of El-Hazard in the balance, three factions vie for control of the most feared weapon ever created&hellip; the Demon-Goddess Ifurita!