So i'm pretty sure that i'm gonna finish the game single. But i've heard that you get stuff that helps you if you decided to do another play through is that true?
Yeah. You gets cheats from all the best endings.
Toru gives max personality stats (charm, knowledge, can't remember the 3rd one)
Shuu gives max money
Shiba gives max VA stats (tech, chara & singing)
Hikaru gives 500 fame (Superstar fame)
Tochan opens up the route for 2 secret characters (Kaede & Kei)
the last cheat from toru's route is affection.. the max is "saint"