Toaru Majutsu no Index - Volume 1, Chapter 3: The Grimoire Peacefully Smiles. "Forget_me_not."

Born and raised in a lab Tristan must figure out how to live and survive in the outside world. To make matters worse he has 4 others to look after. He's the oldest but is always being taken care of, to make sure his lab siblings want for nothing, Tristan will need to make a difficult decision. The goal is to provide for his siblings but he ends up living just like he was groomed to live. On top of everything else, there are four alphas who want to mate with him, and they don't mind sharing. Will Tristan accept his fate? Or will he runaway?

Luo Qing Chen is a wandering spirit that died thirty thousand years ago, roaming the Chaos Space

In order to not turn into dust, she is bound by an ice cold system to travel through time and space to complete missions.

Girls that pretend to be weak?  Slap them without explaining.

A silly cannon fodder?  Helping them amass treasures.

Meeting a real male god?  All of them will pamper.

System: Dear masters, what do I do if my host even dares bully the heavens?  Waiting for an answer, it’s urgent!

A certain male god: Change systems.

System: ヽ〔?Д?〕丿

The mountain village boy accidentally got the fairy gourd, and he rose step by step to cultivate immortality and longevity.

Ripe elixir, mortal flow.

- Description from novelbuddy

In the magical Yarran World, a group of extraordinary professionals ventured into dangerous places for knowledge, wealth, thrill, and honor, exploring secrets hidden in the depths of time. Coexisting with dangers, they were given a fitting name—adventurers.With so many adventurers around, there would be a few oddballs, of course. Take for instance, the swordsman who used to be a thirsty hedonist and now spent his days looking for ways to put his life in danger; the knight who saw gold coins as his ultimate pursuit; the schizophrenic and overly curious priest, and the genius mage who was prone to zoning out and could not care of himself. What kind of strange stories would these kooky individuals create when they came together?Alright, all the above are just nonsense. In truth, this is a casual story of an abnormal, unscrupulous middle-aged man and a few problematic girls undergoing self-therapy- I mean, seeking redemption.You have been solemnly warned that this story is purely fictional. If there is any glaring similarity, you probably need self-therapy too.