Soba ni Iru ne was created on 2008-01-23.
Tantei wa Bar ni Iru was created on 2011-09-10.
Kimi no Tame ni Boku ga Iru was created on 2001-04-18.
Anata ga = you Soba ni = next to Iru = to be/exist (living thing) Shiawase = happy Anata ga soba ni iru, shiawase. = "I'm happy you're by my side/here with me."
My nihon is scratchy, but it's better then nothing I guess. It means something along the lines of "because you're by my side (/with me)" depending on the setting.
Tantei wa bar ni iru - 2011 is rated/received certificates of: Japan:PG12
koko ni iru
"Dono yo ni shite iru" can be translated as "How are you doing?" in English. It is a formal way to inquire about someone's well-being in Japanese.
The cast of Kamisama wa Bali ni iru - 2014 includes: Machiko Ono Hiroshi Tamaki
Tsuki wa dotchi ni dete iru - 1993 is rated/received certificates of: Argentina:13
There are 5 volumes.
You may say 'anata no soba ni itai.'
doko ni iru no Hope it helps!