Duel Savior v.1.13

One of those games that are worth playing because of the plot, characters (voice acting is great), and gameplay, and H-CG is just a nice addition.
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A guy and his sister (orphans) find themselves in another world at the call of a strange magic book, where, according to the prophecy, another invasion of Evil is expected.
Once every 200 years, legions of monsters appear out of nowhere under the banner of Destruction and seek to destroy all life in the Central World (which is quite small in itself) and generate a wave of similar invasions in all neighboring worlds.
To repel the threat, people created the School of Saviors, where girls with a certain gift train to summon Etheric Weapons that can resist monsters and their leaders with similar weapons, and soldiers who will help them in battle. But there are very few such girls, so those with the talent of the Savior are called from all available worlds.
Our heroes get to this very school, and the girl is immediately asked to pass the test for "professional aptitude" in their arena in order to awaken the skill of summoning the Weapon. But the brother does not agree to expose his sister to such a danger, and he himself jumps into battle. There is only one problem - there have not been any cases in history when a man had the gift of the Savior.