Tsuyoshi is sweet and nice. Nothing is very special about him, he acts like your regular guy and has a preference of female partners, though other relationships seem to not bother him.

High schooler Masahiro Setagawa is a fairly helpless delinquent, so much so that the neighborhood bullies use him to run their errands. His life changes when he meets high school teacher Kousuke Oshiba, a man whose fighting abilities have earned him a powerful reputation on the streets. Oshiba finds himself with a desire to protect Setagawa, and despite swearing that he's not interested in men, Setagawa finds himself getting more involved in Oshiba's affairs...
 
(Source: Sentai Filmworks)

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Masahiro Setagawa doesn't believe in heroes, but wishes he could: he's found himself trapped in a gang of small-time street bullies, and with no prospects for a real future. But when high school teacher (and scourge of the streets) Kousuke Ohshiba comes to his rescue, he finds he may start believing after all...in heroes, and in his budding feelings, too.
 
(Source: Kodansha)

"Either you let me make love to you, or we end our friendship again. What's it gonna be?"
 
Before Masahiro and Kousuke's whirlwind romance in Hitorijime My Hero, there was Hitorijime Boyfriend—and now, the origin of one of manga's biggest franchises is finally revealed! Back in sixth grade, Kensuke had a falling out with his best friend Hasekura that still hurts three years later. Then, one day, Hasekura is suddenly back in Kensuke's life like nothing happened. What, exactly, is going on? And what will Kensuke do when Hasekura wants to take things to a whole other level...?
 
(Source: Kodansha)
 
Note: Contains an extra chapter.

Tsuyoshi Yamabe