I could not bring myself to continue after chapter 5.

I    J u s t    C a n t.
MC has lingering feelings for his friend's... GIRLFRIEND. 

That same girlfriend is also making ADVANCES towards the MC...

I can already foresee a future where the best friend gets cuckold, and bro doesn't deserve that. (This is not the way my brothers...)

Also, don't try to defend the MC. It's literally his fault for not trying to establish strict boundaries between him and his friend's girlfriend. SHE WAS LITERALLY UNDRESSING ON TOP OF HIM, AND HE BARELY DID SH** ABOUT IT.

Now, the only way for this shitshow to make sense is if they reveal that the best friend is evil or something. But that'd seem like the author's excuse for pairing his girlfriend with the MC. (And it'll sound too generic if it actually happens, LMAO)

But read this if it suits your tastes ig....

I finished reading this book few minutes ago. I really liked it. This story takes you in a "lifetime" journey between these two men who know each other for all their lives. You share their happiness, their sadness, you see how this love goes through different steps. A heartbroken manga  but very beautiful at the same time. Definitely, recommended. I also suggest to watch the Japanese drama based on this manga.