nl10, K6s on BB

[Baited]

This is a HH from a friend of mine and I would like opinions if he should be calling here.

Poker Stars, $0.05/$0.10 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

UTG: $24.50
CO: $15
BTN: $13.10
SB: $9.70
Hero (BB): $21.35

Pre-Flop: 6[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
UTG folds, <font color="red">CO raises to $0.40</font>, BTN calls $0.40, SB calls $0.35, Hero calls $0.30