The manga is alright but I can't recommend the light novel enough. Some of the best written relationship dynamics going on between Miyagi and Sendai. I got hooked up, read everything that was available at the time (like 360 chapters) and then went back to rereading it all over a couple of weeks later.
They have a codependent and often toxic relationship but all their actions are justified by their past experiences, the characters have great depth and their dynamics are always interesting to read. The way they slowly get more physical and intimate is just perfect. But it is an extremely low burn, which might be a let down for some.
For me, the pay off is totally worth it. It doesn't feel like a classic yuri where every action they take and every decision they make helps progress the relationship. There are miscommunications and misunderstandings, hesitation, uncertainty. But that just makes it feel more realistic.
Again, this is an extremely slow burn. But it also feels like the characters could be real people, with real worries and real struggles. And both of them struggle communicating with each other verbally, but the tiny gestures more than make up for it. Every caress, every touch.
Please, read the novel.