MTL - Nuclear Power Sword Immortal - Chapter 786 small world

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Within the world of Arcadia, there exists an eccentric restaurant. The restaurant causes countless apex Mages to set aside their arrogance and pride, just to feast upon its delicacies. What did you say? You want to abduct the Chef? Could it be that you also want to force him to be your personal Chef? Are you an idiot? You would first have to get through a legion of men and women whose stomachs and bodies were thoroughly satisfied. Not to mention, the restaurant is guarded by a Divine Fox who killed a Mana God Realm Mage with a casual whip of her tail. What, a Divine Fox isn’t strong enough to scare you? Then, how about a group of Yanderes?

All the firsts I want to remember were with you.From the summer when I was eighteen and knew nothing to the summer when I turned thirty-one and learned so much.Even the seasons without you felt like you were deeply ingrained.“We’re just friends, so there’s nothing special between us.”You pushed me away with a poker face, but because we were friends,I endured those countless days,and it seems you still don’t know it.So, it looks like I’m going to repeat the same futile effort.“Did I ask if you needed a man? If you do, I’ll be your man.”You need to get to know the thirty-one-year-old me.If you look at me with those eyes you didn’t see before.“You’ve become a real troublemaker.”Now that you’re here, it’s just the beginning of .

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?