This was one of the first H-manga I ever read... I was... Fuck, can't remember really, but I was still shotacon bait x'D that first time reading it was just for the sex, I was just starting to explore my sexuality and TBH later I learn more about sex and healthy relationships with this ero manga than with the cheap trash my school gave me as SE or the very awkwards talks with my parents.
The second time I read it was just after a relationship that turned out to be abusive, emotional and sexually abusive. At that point I was almost a sex addict and I could see lot of myself in Hikaru and Tsuda 'cause I had lots of doubts about the nature of love and my self worth given my least than normal libido.
Reading it helped me a lot.
Now I read it again, I can just smile and thank Sessyu-sensei for this heartfelt manga and how much it help me to accept myself.