I've been dating Chiharu-chan for half a year. - She is a young lady who has almost no love experience and doesn't even know the meaning of a sex friend. - One day, while I was walking with Chiharu-chan, I ran into a senior who was a bitch. - I can't let that senior get close to Chiharu-chan. - Even though she thought so, before she knew it, Chiharu had fallen under the poisonous fangs of her senior who approached her with clever words. - And the neat and innocent Daru-chan starts to change as you watch...