[ZeKeR]

also, if the cousin is:

younger than him
-ZOMGWTF WE SHALL KILL THIS HERETIC!
-tears of blood at the 'onii-chan' honorific
-Mizuki yandere mode ACTIVATE
-Minami tsundere as ever
-Akira DO NOT WANT her in the same roof as Aki
-attack of the mofu girls!

same age as him
-Mizuki yandere mode ACTIVATE
-Minami tsundere as ever
-Akira DO NOT WANT her in the same roof as Aki
-quite popular and everyone shall be in disbelief that she is Akihisa's cousin

older than him
-everyone's disbelief that she is his cousin
-ALL 3rd years shall stick thar eyes on her
-FFF inquisition
-Mizuki yandere mode ACTIVATE
-Minami tsundere as ever
-Akira DO NOT WANT her in the same roof as Aki
-Miharu's onee-sama radar shall probably change direction