This manga really touched my heart in a lot of ways.
(No, the literally way is not one of them).
Even though there were some problems with nearly every character at some point, the writer always managed to have a way to get me to love them again.

WARNING: Spoilers Ahead.

Let's start with the main character of the story, Makabe/Hayase Masamune.
I've seen a lot of people complain about how his motives for revenge were really childish and immature, but I disagree with that.
Sure, he might be holding a grudge for something that happened when he was a young kid, but that event destroyed his childhood, both mentally and physically.
Also, some people have complained about how the switch from revenge to love was extremely sudden, of which I agree, partially, but also disagree.
It is very sudden that the revenge that he had been holding onto for 8 years had suddenly disappeared, but the manga provides a very good explanation for it. Masamune was, essentially, hating Adagaki Aki for a nonexistent reason, and when he was told the actual truth, his emotions changed.
He stopped viewing Aki as the cruel, tyrannical b*tch that he used to view her as, but instead now viewed her as the kind-hearted person who had helped him get stronger, who had helped him when everyone else was bullying him. It was only natural that his feelings would change.

Next, let's talk about the "heroine" of the story, Adagaki Aki.
Again, she's also quite a complex character.
Her motive for rejecting men cruelly is essentially this: "Men always disappng thear and leave me by myself."
This was caused because, (in her eyes), she was abandoned and left alone not only by one person, but by two.
This is the primary reason behind why she keeps pushing others away.
She is sick and tired of being betrayed by the ones she trusted.
However, she is also shown not to hate Masamune for abandoning her.
In episode 9, near the end, she is shown to be reminiscing about the blissful times that she spent together with Masamune, stating that if anything was love, that was love.
This is further expressed when her joy is shown that Gasou comes, saying that he is Masamune.
She continues her relationship with Gasou, even when he gives the response "Who cares?" to her question of why he had left her alone 8 years ago, even though it had a massive effect on her life.

Her love for Masamune is not unprecedented either.
She fell for him not once, but twice.
First, as a child, and second, in the present.
It must have been a shocking revelation for her when she released the two were actually one.
In fact, her love is so deep that she still loves him after realising that everything he had done for her (in the present) was a fake, and part of his plan to get revenge.

Now, I'll move on to talk about Fujinomiya Neko.
Her character is that of an interesting one. There are so many mysteries surrounding her, as that is the type of character she is portrayed as.
Her motive for "getting close" to Masamune was a very interesting one.
She knew that there was a 30% chance of her dying soon, so before she (perhaps) passed away, she wanted to experience one emotion.
Love.
All Neko knows about love is from what she has read and hear about.
And she wants to experience this blissful emotion before she dies.
Even if that means harming the others around her.
However, after she first gets rejected, she falls in love with Masamune for real.

She is also shown to care(?) about Aki in a sort of roundabout way.
She warns her not to get close to Masamune, as she knows about the truth of his revenge plan, and whether it's because she actually wants to help Aki or because she wants her "out of the way" for her relationship with Masamune, She warns him nevertheless.

She is shown to be very dense about her one personal affairs as well, being completely bewildered by the fact that Kojurou likes her.

Now for the final character I'm going to talk about today, Koiwai Yoshino.
She is Aki's personal servant, always obeying her every order.
She is... a very interesting character.
She was the one who instigated the whole event that eternally(?) scarred Masamune and Aki when they were kids, although she was extremely repent-full and sorry about it in the aftermath.
She does everything in her power to help Masamune and Aki get together, even if it means hurting herself and her emotions, as a way of making up for her... sin.

The story of this manga is also amazing.
It weaves all the characters together so finely, so perfectly, that nothing feels unnatural at all.
The ending was completely beautiful, and it was one of my favourite parts of the manga, although I would totally love more of it.
Overall, this Manga is completely amazing, and I would definitely recommend reading it.