>>536492579
Yeah it's pretty much that. I'm using Female Trainer so this is my extra jam
Admire Groove grew on me too. At first, she doesn't understand a single thing about love, even the parental and friendly ones. Hence why Admire is confused when Air Groove is looking out for her, or when she sees Trainer comforting Still in Love early in the scenario. But she freaks out after the second summer camp event, when she catches a glimpse of the corrupted state of "love" between Still in Love and the Trainer (pic related).
Even Mejiro Ramonu finds this kind of love "suffocating" in a bad way and Neo Universe (being SiL's dormitory roommate) tries to give a warning ("no HPED" in sight).
>>536493280
I haven't unlocked the onsen event yet, only got the 3rd prize carrot sorry.
But the good ending has the Trainer being cured from the illness after months of hospitalization, without really knowing the cause. It's later stated that sticking close to Still in Love makes the symptoms of said illness / curse appear and become worse over time, although it's somewhat implied the crazy beast side of SiL plays a large role at that too (and which manifest when it seeks to race against strong competitors). But despite all of this, both SiL and the Trainer vow for each other till the end.