This type of a protagonist is totally immune to romantic and sexual advances. He/she can't read the atmosphere at all. This protagonist may be a genius but still can't understand the feelings of anyone towards him/her until a clear confession is made. Even then he/she needs to ask for a confirmation about it and think for a while to understand what that means. The people who are in love with this protagonist can do everything to make him/her understand, from occasional kisses to even having sex under poor excuses (like transfering mana etc) but they have no chance to be understood, none at all...