If you're looking for manga similar to The Days After the Hero’s Return, you might like these titles.
Morishita Daiki became a hero after being summoned to another world. After skillfully striking down the Demon Lord, he returned to Japan. Daiki, with his strength concealed, was living a tranquil day-to-day life. However, apparitions and those with special powers run rampant in this seemingly-normal world. A supernatural school-battle epic rarely seen in the modern era unfolds in the shadows!! A story about an unbelievably strong hero returning to the modern era after his adventures in another world!
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Both these manga features a protagonist in who in the past has been isekaied to another world and now they are returning back to the world they originally came from but with some turn of events they seem to retain their otherworldly power.
A god of a different world had abruptly appeared in Kamiya Yato's classroom and forcibly summoned the entire class to his world... except for him—because he was sleeping in a seat in the corner of the class, the round summoning magic circle didn't reach him—and he ended up staying here on Earth, but with brand-new skills. After he made it through a whole year full of police interviews and journalism reports, he finally became a high school student, but the quiet days he had hoped for were far from over—be it terrorists who decide to occupy his school or even monsters from different world, one by one new incidents take place in the town he lives in...Will a boy without any motivation be able to save the world?
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Yuuya Tenjou was fifteen years old and bullied since he was little—just for being ugly. But one day, he found a door to another world. Traveling between an alternate reality and the real world, Yuya turns his life around!
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They both have someone who went to another world and kept their powers from the world they went to and can both go into the other world at will
Morishita Daiki became a hero after being summoned to another world. After skillfully striking down the Demon Lord, he returned to Japan. Daiki, with his strength concealed, was living a tranquil day-to-day life. However, apparitions and those with special powers run rampant in this seemingly-normal world. A supernatural school-battle epic rarely seen in the modern era unfolds in the shadows!! A story about an unbelievably strong hero returning to the modern era after his adventures in another world!
On the first day of high school, Yuuki Kousuke was killed while trying to help someone. However, that was not the end of his story. The old man he helped happened to be a god. As thanks, he lets Kousuke reincarnate into another world. He was overjoyed to live the life of those overpowered protagonists seen in his favorite isekai stories, however, when he came to, he found himself at the very same spot he died. This is the story of a protagonist living a peaceful life in the modern era with the cheat ability given to him by a god... not. The cat he ended up saving turned out to be a god too.
After saving a fairy-tale kingdom, Akatsuki returns to the real world with his prize—Miu, the busty daughter of the defeated Demon King. It’s one hell of a happy ending until they’re forced to enroll at a school for magic users. There, Akatsuki can’t keep his hands off the girls, Miu’s constantly ballooning measurements make her a walking wardrobe malfunction, and it seems like someone is always plotting against them.
Sakai Yuuji thought he was a normal high school student, until one fateful day when time stopped. Watching in horror, he witnesses a monster devouring the "frozen" people around him; but luckily for Yuuji, he is saved by a sword-wielding red-headed girl that calls herself a "Flame Haze". The girl informs him that he has been dead for some time now and that his current self is merely a replacement for the human that he used be while alive. He is, she says, merely a torch whose life will come to an end when the blue flame in his chest ceases to burn. After this rude awakening, Yuuji realizes that he is able to see the flames of life in other "torches"; and after discovering that a friend of his is also a torch -- and her life is burning out faster than his – he gains the courage to live out the rest of his life with meaning. Will Yuuji be able to find his place in the world before he ceases to exist?
When his oddball father suddenly decides to remarry, high school student Toujo Basara is about to acquire some very peculiar new family members. Enter his new seductive step-sisters, Mio and Maria. When Basara discovers that one of his step-sisters is a succubus and his other a recently crowned demon lord, all hell breaks loose! Basara is almost forced into a contract with his demonic sisters where he would act as their eternal servant—but something goes wrong. Instead, a reverse contract is formed, and Basara becomes the master. Between fending off their seductive advances to coping with the attacks of rival demon contractors, Basara has a big learning curve if he is to survive.
Raul Chaser wants to be the Hero famed for defeating the Demon Lord - at least, that used to be his dream, until another warrior beat him to the punch! With peace now restored and all Heroes out of commission, Raul reluctantly gets a job at Leon, a small store that sells magical commodities. Compared to slaying demons, Raul’s new life of greeting customers and working the register is uneventful at best - that is, until Fino Bloodstone, the Demon Lord’s busty daughter, is suddenly hired at the stop! Raul now faces a challenge more difficult than vanquishing her father: teaching the clumsy and ill-mannered Fino how to become a respectable employee, while simultaneously fending off tentacle monsters and putting up with pervy regulars’ skirt-flipping antics!
Seventeen years ago, Takafumi’s uncle fell into a coma, but now he’s back like a man risen from his grave. Soon, Takafumi discovers two bizarre things: His uncle treasures video games above all else, and, while comatose, he was actually transported to another world as some heroic guardian! Now, not only does Takafumi have to room with an uncle who is literally magical, he also has to catch the guy up on two decades of history — smartphones, high-speed internet, modern anime tropes… and the traumatic outcome of the ’90s console war!