Keisuke is Akira's childhood friend, and who also participates in Igura in the anime Togainu No Chi.
History
Keisuke is Akira's childhood
friend, as they grew up in the same orphanage together. When Akira joins
a street fighting game called Bl@ster, Keisuke refuses to leave his
side. And, when Akira is forced into playing the deadly game Igura,
Keisuke follows him, despite Keisuke's lack of fighting skills and
weakness.
Personality
At the beginning of Togainu No Chi, Keisuke is shy and loyal, constatly
sticking by Akira's side as they did when they grew up in the orphanage
together. But as both the anime and PC game progress, Keisuke is
corrupted by Igura and Toshima. Keisuke wind up taking Line and becoming
extremely yandere over Akira
(more so in the PC game than the anime). During the anime, Keisuke is
fairly calm.
PC Game
In the PC game, Keisuke's character follows a very different path then
from the anime, this is because the anime completely toned down the yaoi. After Keisuke
joins Igura and begins to stay with Akira, things seem fine, until Akira
snaps at Keisuke for not standing up for himself. Keisuke runs away
from Akira, and Akira chases after him. It takes a while for Akira to
find Keisuke, but when he does, Keisuke has become extremely twisted
claiming he wanted to see the expression Akira would make when he kills
himself. On the way to finding Keisuke, Akira runs across a bar where
everybody inside was brutally murdered.
The two fight, but ultimately split up. Not long after, Keisuke chases
after Akira. Keisuke finds Akira and knocks him unconscious.
It is revealed that these actions are due to Keisuke taking Line. Akira
is left in the shack until he wakes once more and realizes that Keisuke
is seeking him out once more. Keisuke returns to Akira, admitting that
it was him to killed all the people in the bar. Keisuke claims he wants
to see Akira's 'dying face', and the choice is left to the player as to
whether or not they will kill Akira, or save him.
If the player chooses to kill Akira, Keisuke tears out Akira's
intestines, claiming that Akira is just as beautiful on the inside. And
thus ends the bad ending of Keisuke's story.
Keisuke and Akira happily ever
after
If the player saves Akira, Akira knocks Keisuke unconscious and brings
him to an old shack. Keisuke begins to thrash and have a dangerous
reaction to Line, but Akira is able to calm him down. The two escape
Toshima through the sewers and manage to start life over again as
factory workers. And thus ends the good ending.