I ran into the same thing. Figured out that you have to not go with her to the hospital the previous choice, which sets you down the better path.Hm...i somehow only get the bad end on Lina's route, MC talks badly about the previous owner of the restaurant when he speaks with Tomoe. Where did i screw up or is there no good ending in Lina's route yet?
Seems counter-intuitive and weird, but that's the 'good' option.