honeycomb's manga / #Cruel guy(1)

(Arranged Marriage) Mikoto Inui lives with her rich grandfather whom is worried about what will happen to her when he's not there anymore he wants her to attend an omiai [an arranged marriage meeting] while she'd prefer to go live on her own she agrees she meets Saruno Itaru, whom she likes right away. They decide to get engaged but,things aren't what they seem to be he only wants to use her family for their $$$ if she doesn't go thru with it what will happen to her ill grandfather... What will Mikoto do there seems to be no winning