Exactly, I read the manga first too, and it doesn't really show any sign of BL.
The problem is, nowaday even if they made anime with the combination of "Guy & Guy", they REALLY LIKE to make those two looked like gay, when they're really not.
(it's like they're trying to attract BL-loving-female audiences...)
Look at Tiger & Bunny...u can clearly see that, they definitely and intentionally put the BL atmosphere in the show, such as Bunny did Princess Hugs with Tiger, TWICE in fact, and one of the times appeared in FIRST EPISODE...
How can ppl NOT to think the show is BL or gay?