Keiko is dating crystal. Keiko is very flirty with crystal, keiko often has "naughty" time with him.

One day. Crystal is watching his phone. Then. Keiko pushed him on the bed and got on top of him. Crystal says "H-hey what are you doing??", Keiko says "just having fun ~", Then he unzips crystal's pant and says "What a cute 'stick' you have~", then Keiko starts his naughty time

Keiko is also a dangerous mafia member. He's strict and cold to everyone expect crystal