Broken Sword 4 has been released 2006. It's not old enough. :'-(

It seems that I was on the wrong track all the time. Hey, Puzzlemaster you've skipped one of my questions. *smiles*
I will wait for your reply to ZFR's question...
I hope that it is not a horror adventure. In that case I give up.

In that case, it looks like you've reached your rope's end.
It is. Time for you to give up, my poor friend.
The character's haughty with British pride.
His family's keys, they attempted to hide.
I'm not sure which question I missed,
Unless you refer to the temple gist.
In that case, I'll note this, if I may:
It's no temple indeed, but a castle, I say!

A pure guess here will not get you far.
I'm an aficionado - a point-and-click star.
You are incorrect, but do not cry.
As far as genre, you have not gone awry.

There're Agatha Christie's video games? Why I didn't figured out until now? Thanks! :)

Edit: a pleasure to read your poetry lines, zeogold

What? How on earth did you not know?!
Here is a link for me to show:
http://www.amazon.com/Agatha-Christie-Triple-Murder-Mystery-Pack/dp/B001POC5QM/ref=sr_1_2/181-4131601-6915355?ie=UTF8&qid=1450228490&sr=8-2&keywords=agatha+christie+video+games
Ah, The Adventure Company, RIP.
How badly, how sadly, do we miss thee.
On that sad, mournful note, I should give a hint,
So for that, I'll mention this lovely fact:
My game was published by these beloved folks
Before Nordic Games signed that fateful contract.

Black mirror? Well I'm going to try black mirror right now in any case ^^ I have bought it in some HB deal but I've never try it. Wish me luck! good luck to you too guys, with the puzzle and the rhymes!

I do not know what game it may be
Poetry and rhymes also sicken me
But still, this puzzle, it ignited a spark
Could the game be Alone in the Dark?
I never played it so I cannot be sure
If keys are what one has need to procure

And by the time I finished this post… Uuuh...
.... The puzzle master added that it is a point and click adventure game (no rhyme here, I am done).

Uuuh…. Let me just guess... Is it a Call of Cthulu game?
Those are point and click... Right...?

EDIT: I am bad at italics, so I'll just leave it as it is
EDIT2: I am also sorry for the terrible rhymes
EDIT3: Call of Cthulhu is also based on a book, so just ignore me
EDIT4: nicohvc is probably right, Black Mirror would fit in perfectly

A winner is you! And now, it is time
For me to end this puzzle and ditch the rhyme.

The "dark, sacred place" is Black Mirror castle. Samuel Gordon is the stuck-up protagonist (he blatantly bosses around everybody and acts entitled to everything). It's old because it came out sometime in the 90s. The hardest clue, the "genius shank" is referring to the part where, after getting into William's study, you find a small knife hidden in a black rook from a chessboard. The person who ends up in "the drink" is Henry, who is found dead in the fountain outside. It's technically a horror game, although honestly, it's not that scary. Just kind of a foreboding environment.

Judging from the school theme and the reference to Dragon Ball Z, I'm guessing this is some sort of Japanese game, which I never play, so I'll let somebody else take a swing at it.

@zeogold:
Thanks for taking part in this game. I really like your rhymes and the hidden clues. I admire your talent. +1

@nicohvc
A shot in the dark - Celestian Tales - Old North
It is the first game that crossed my mind after reading your description.
Can this game be found on GOG?

it's not Celestian Tales but you are somehow close. Also, about your question, the tittle is available on GOG.

here is the DBZ reffered similarity (at 05:02 just a few seconds)
https://youtu.be/3p2WnlocysE?t=302

Trails in the sky, first chapter. Damn, I first though they were some highschoolers. But no, Bracer graduation.

Right !

Sorry for the late. I don't know why I didn't receive any notification about this thread. Your turn Naszrador!

Hey! It's your turn. ;)