Does anyone know of any mangas...?

Arisa

For years the rash tomboyish Tsubasa had communicated with her twin through letters. She had formed the idea that the gentle Arisa led a joyful school life. But upon Arisa's sudden suicide attempt, Tsubasa vows to find the reason behind her twin's actions by taking her place at school. But will this supposed joyful life be too much for Tsubasa to handle? What does it have to do with the people disappearing from Arisa's school...

http://www.mangaupdates.com/series.html?id=35505

Tantei Revolution

Recently an exceptionally skilled female detective has appeared, and the identity of this highly talked about figure is actually high school student Seika. The case she has taken on this time involves the search for a client's missing younger sister... but now even the younger sister's fiancé has gone missing...!?

http://www.mangaupdates.com/series.html?id=367

Deka Kyoushi

Police detective Toyama goes undercover as a fifth-grade teacher to a rowdy class in order to discover the truth about the previous female teacher who apparently jumped off the roof of her condo. The students are keen at first to lay the blame on their strange classmate, Makoto. But Makoto has the gift/curse to see people's inner demons, which are often expressed through horrible images. When these hallucinations melt away or disappear, the problem is solved. Will Makoto have a vision about his former teacher, or will Toyama have to solve this case on his own.

http://www.mangaupdates.com/series.html?id=22170

Hope you like them =)

POKEMON, DIGIMON, YU GI OH !!!!!!!!! WOOOOOOOOOO