Shiraishi Shoutarou, a novelist, just learnt that his young and honest editor-in-charge, Osanai Masumi, would marry his precious daughter. But his daughter went missing right before the wedding! So now, Shoutarou is living under the same roof with the man who was supposed to be his son-in-law...

• Creator: Itsuki Kaname
• Status: Ongoing
• Vintage: N/A

• Alternative Titles: スマない!!マスミくん, 非常抱歉！真清君

• Genre: Drama, Romance, Yaoi

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• Sumanai!! Masumi-kun Chapter #005 - Last Chapter & Prologue & Apology
• Added: 1/9/2011
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• Sumanai!! Masumi-kun 4 - Chapter #004
• Added: 1/9/2011
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• Sumanai!! Masumi-kun 3 - Chapter #003
• Added: 1/9/2011
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• Sumanai!! Masumi-kun 2 - Chapter #002
• Added: 1/9/2011
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• Sumanai!! Masumi-kun 1 - Chapter #001
• Added: 1/9/2011
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