Shinyuu Inai no Dare?

Synopsis

What's the difference between a friend and a best friend? In the workplace, at school, around the neighborhood. I had friends everywhere, but... My best friend, who I met again for the first time in 4 years, was cradling a child in her arms. Pregnancy and childbirth... She's supposed to be my best friend, so I can't believe she didn't report such important life events to me... Do you have anyone you can call your best friend now? (Source: Shueisha, translated)