Douluo Dalu 2: The True God King - Chapter 284: [DD2]:

Everyone believes Lin Zhao Xi’s a genius.

Only she knows she’s looking back on years of experience in math competitions as a basis to “cheat”.

Until one day, her idol quietly looks at her.

* * *

Time and space overlap, returning thrice.

— The past can change you.

- Description from Novelupdates

This crossing is so strange, death crossing, game crossing, etc. are probably barely acceptable, but why can you cross even if the fish tank is broken?

and actually passed through the magic tree in “OVERLORD” that is said to be able to destroy the world?

No! It is sad enough to regenerate into a plant. The protagonist, Ainz Ur Gong, the undead king, has also accepted the adventurer’s guild mission and wants to kill me!

I want to change my destiny! Live! I want to-surrender!

Ainz: Since he has accepted the job commission from the Adventurer’s Guild, deliberate failure is detrimental to the prestige of Ainz Ul Christine (the “surrender” button has been deducted)

actually died as soon as he crossed, but there is still a chance to return~ from the beginning of the magic tree to this world.

I must change my destiny this time! Live!

- Description from novelbuddy

Felix was reincarnated as Lindarion Sunblade, a prince of Eldorath, destined for greatness—or so they say. In a world where magic, swordsmanship, and archery reign supreme, power is everything, and the strong shape history. But strength isn’t given, it’s earned.With a System awakening within him, one that pushes his limits with deadly quests sometimes, helps him with skills, and helps with forging weapons into legendary artifacts, he refuses to be just another noble in a gilded cage.Trials await, enemies lurk in the shadows, and even among his own kind, power breeds conflict.But he will rise. Not just as a prince—but as a ruler, a warrior, and a legend over the entire world.

Fate, a gatekeeper who had been working for the castle, is beset by a few burdens.