Start in DxD as Motohama: Leveling Up in Another World - Chapter 5: Food from another world. Visit to the library. An unusual new friend.

Keiran has always dreamed of being a hero—exploring vast worlds, defeating powerful foes, and growing stronger with every battle.In his favorite RPGs, he could live that fantasy. But when he's suddenly summoned by the god of Eteria, his dream becomes reality.Chosen to stand against the encroaching darkness threatening to consume the world, Keiran is granted four extraordinary abilities: the power to absorb, upgrade, create, and transfer skills.With limitless potential at his fingertips, he embarks on an adventure to collect, refine, and bestow incredible powers upon allies and himself.As he hones his abilities, forging new paths in magic and combat, Keiran will shape Eteria’s fate.From a summoned gamer to a legendary hero, he will not only fight the darkness—he will redefine what it means to be powerful.

Legend says, that there is a great demon, who is the human kind’s public enemy. He is the galaxy federations’ nightmare as he wanted to conquer the whole universe. On the first day, he completely took out the human fleet, plunging them into disorder. On the second day, he declared that he will wipe out the whole federation. On the third day, he declared——that the hero who shot him in their previous battle must marry him, or else, he will destroy everything.

The galaxy federation president and the council members had a long meeting after that. They decided to dispatch a soldier, Wu Xing Yun, and marries him off to the arrogant demon. Wu Xing Yun was once a hero who fought for the nebula, and henceforth, he was tasked—— for the sake human race and the universe’s peace, to eliminate mistresses, settle his matters with the mother-in-law, and fix the man’s crooked ways.

Wu Xing Yun was very perplexed when he asked his commanding officer: “Sir, why did it have to be this way?”

Commanding Officer: “Soldier, bear in mind, that this mission of yours, is for the sake of the universe and mankind’s happiness. You must hold on to your husband, and fight other mistresses! Do you have the confidence to accomplish this task?”

Wu Xing Yun, stood straight, saluted, and instinctively replied: “Sir, yes sir! I will accomplish this task!”

- Description from Novelupdates

In her third year living in this steampunk world, Ciel gained the ability to simulate both the past and the future.These simulations turned into a game where she could act without restraint, and after countless trials, real life became a replica she could navigate as though speedrunning it.Churches, potions, mutations, the Old Gods, witches, sealed artifacts… none of these have anything to do with Ciel. She’s just an ordinary girl who wishes for a peaceful life.She just happens to be particularly skilled at snuffing out danger before it even begins.

In the nation of Avrael, power is both a blessing and a curse. Sixteen-year-old Ayato Daath, a poor orphan, had always hoped to live unnoticed in the shadows of the city. But when he is forced to undergo The Rite of Manifestation, the ritual that determines one’s magical potential, his worst fear comes true—he is an Elite.Now torn from the only life he’s ever known, Ayato is thrust into a brutal world of magic, bloodshed, and treacherous politics. In a society where the strong prey on the weak, where rival factions scheme in the dark, and where a single misstep could mean death, Ayato must quickly learn one thing—adapt, or perish. And one thing Ayato already knows is that in Avrael, only the ruthless survive.