PHILADELPHIA — The members of Modern Baseball, a budding four-piece rock band based here, laugh constantly at everything: how they managed to graduate from college while touring the country, Internet memes, one another’s romantic histories, even a near suicide that almost derailed the group’s biggest, most important release to date.

“I like how we’re at this point about it,” said Brendan Lukens, 23, after the giggles subsided as he detailed the lowest moments of his young life. “That feels good.”

Scruffy and laid-back in the distinct manner of 20-somethings without office jobs, Modern Baseball has led something of a charmed existence, despite its personal hurdles. By playing an outmoded style of music — somewhere in the much-derided space between pop-punk and emo — with zero pretense and almost too much heart, the band has created an intimate, largely D.I.Y. world (and gained an obsessive following) that feels fresh and vital, even within a genre that crested more than a decade ago and has largely resisted sonic evolution.