There shouldn't be routes where Takumi likes people other than Karua. He should return to her no matter what happens, in any timeline. It would have been so romantic. Kodaka has never loved anyone clearly. Takumi is for Karua in EVERY timeline, he's a slut for running around fucking Darumi and Gaku because who-cares-do-anything

In Greek mythology, Sisyphus was the founder and king of Ephyra.
His cheating of death earns him eternal punishment in the underworld.
The gods forced him to roll an immense boulder up a hill only for it to roll back down every time it neared the top, repeating this action for eternity.

Go finish a route anon, you probably have a hundred or so hours to go right? Do it for Nozomi?