Sharing Dreams with My Bestie's Cousin - Chapter 1: Dreamland

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

Hanekawa is transmigrated to a body of Kumogakure's spy inside the Konoha and become Tsunade's discipleWill he stay faithful to Konoha, or he ended up betraying Tsunade?

This is a world where everyone participates in simulations, amidst an eerie apocalyptic setting.Only by performing a Heaven-defying Fate Change in the simulated life can one avoid being consumed by the black mist.Lu Yuan crosses over accidentally and gains an Adaptive Talent, receiving a Divine-level Talent automatically in every simulation!First Life: A modern technology world where Martial Dao is in decline.[Heaven Rewards Diligence]: With every bit of effort, reap a hundredfold reward; even breathing makes you stronger!Second Life: A Magic World, reincarnated as an ordinary skeleton.[Undead Calamity]: Transform into the Undead Dominator, using the Catastrophe Legion to battle against the Abyss Demon!Some Life: Parasitic cultivation, where cultivators are reared by the Insect Race.[Heaven-defying Comprehension]: Deduce the Gu Dao cultivation system, becoming the first Gu Immortal in history!As each Divine-level Talent is activated, the Gods and Demons finally discover in terror…

After coming out of a tunnel… it was pitch dark.