"I... want you to... have se-sex with me...!" 
The office lady Sumire is not good with men, because she grew up in an environment surrounded mostly by women. 
So she has never had a boyfriend in her whole life! But she wants to experience it at least once... to have sex!
That's a tough hurdle for someone who has trouble dealing with men. So she asks Tachibana, who is the only man she can speak to normally at work. He says he'll have sex with her, with some conditions...? 
A sweet story between a [Popular and handsome colleague] x [Beautiful but unpopular virgin OL] that will keep your heart throbbing... This is a romance of sexual awakening!
 
(Source: Bunkasha, translated)

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