I opened a shop on the Astral Train - Chapter 72

He had four disobedient disciples, who now achieved success, won recognition and established their own sects.

The embarrassing thing is that it was him who drove those four out of his sect to make them independent.

But one day he had an incident and lost his cultivation. His life was hanging by a thread. Wandering around, he walked into his third disciple’s territory.

What should I do?

Mountains and seas can be tamed, days and nights can disappear.

Only you, the exceptional you, refuse to give up.

——

A man blessed with fortune, the best in his generation, had an accident and started anew; broken in body but firm in spirit, he now uses his wisdom to guide his evil disciples back to the right path.

Notes :
The title 参商 (Shēnshāng) has two meanings:
1) Constellations Shen (ch. “Three Stars mansion”, eu. Orion) and Shang (ch. “Heart mansion”, eu. Antares), which never appear at the same time.
2) Two friends/relatives who are separated/estranged and irreconcilable.

- Description from Novelupdates

He was once the most feared villain in the empire, a master of manipulation who wove chaos from the shadows. Ruthless, untouchable—until the day he was betrayed and executed by the very man he sought to control.But death is not the end.He awakens in the body of Lady Elara Valcrest, a fragile noble girl doomed to be a pawn in political games. Stripped of her former power, she is forced into an arranged marriage with none other than Cairon Everhart—the man who once killed her. He does not recognize her, but she knows him. And she will never forget.To survive, Elara must play a new game. One where deception is her only weapon, and trust is a dangerous illusion. She must outmaneuver her enemies, uncover the truth behind her execution, and reclaim the power she lost. But as she navigates the treacherous world of court intrigue, one question lingers—Was Cairon truly her greatest enemy? Or had she been blind to an even greater threat?Time is running out. The villain has been given one last chance. And this time, she refuses to lose.

When the spiritual barrier that has been intact for a hundred years is shattered by a meteor, spiritual energy that had disappeared starts to return.The mystical realm slowly begins its revival—magic, witchcraft, curses, supernatural lifeforms, strange and mysterious legends, monsters and gods from other worlds…The old world order collapses, yet the new order is mystifying and chaotic.Just before the unprecedented reformation is here, Tang Qi awakens and finds himself hung on the cross, having turned into an inferior demon and in great pain and agony…With his special ability to see through the nature of all things from the mystical realm and a sly and crafty mind, follow Tang Qi as he develops new skills and powers—as well as making new friends and allies—to battle and protect himself from never before seen supernatural threats in an unfamiliar world!

A series of short stories in the world of Toaru Majutsu no Index organized into chapters featuring Kanzaki Kaori as the protagonist, going around the world and space doing missions for the Church of Necessary Evil, however, there is more than meets the eye as each incident is connected.

One chapter was bundled with each limited edition release of the Toaru Kagaku no Railgun anime DVD and BDs, with all of them together being equivalent to a single normal Toaru Majutsu no Index volume