18+ Kumo no Ito

There lives a particular student somewhere in Japan. He is, to say the least, the very definition of a normal person: a tad bit dull, relatively reasonable, and altogether uninteresting. Nonetheless, this young man is far from a normal specimen at home, as he is subject to constant sexual harassment—primarily in the form of masturbation—from his glamorous and alluring younger sister.

However, when he announces that he will be leaving home to attend university, his sister is furious, accusing him of purposely leaving her behind. He is insistent that this was not his intention. But his infatuated and lovesick sister feels betrayed and won't take no for an answer, causing her to go to great lengths to keep him by her side…