Category:Question : if a character declare a frontal attack and it returns the opposite opponent character back to hand by its effect, can the opponent use a counter-attack event card that sends the opponent character to the memory? Do the opponent get more damage

Yes, the opponent can. No, the opponent will not recieve additional damage. The type of attack was determined to be a frontal attack already, so there are no soul bonuses. Only when you declare the attack and the opposite zone is empty will you do +1 damage.