Kusatta Kyoushi no Houteishiki
Bad Teacher's Equation

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as i ws reading this one i couldnt help but think how simular it is to tyrant all most the same look in chars and thier personalities too but the story line is completly different but if you liked kusatta the you will also like tyrant 

Obviously both are shonen ai but they have the same style of comedy, the main characters are persistent to gain the heart of their beloved one and both have a childish personality, I think Kusatta Kyoushi no Houteishiki is a little more serious in the last volumes because they grew up (keeping the comedy, of course), but I completely sure if you like one, you'll like the other. And they are about 10 volumes. 

Both series contain a character who starts out in love with someone, but ultimately ends up falling for that someone's younger brother. They also both take place in high school, where the main pairing is a student and a teacher. Kusatta Kyoushi no Houteishiki is longer, and more oriented towards the emotional aspect of the relationship--there is little physical intimacy between the main pairing until the last two of ten volumes; Empty Heart, on the other hand, has the main pairing jumping straight into the "physical" and only sorting out the "emotional" at the end of the story. 

same author, bl relationships, nice drawing ^^