Serena no Jouji Zenpen: In'eki no Kairaku ni Ochiru made

A woman of knife mastery Serena has a negotiation with a salacious store owner, wearing bikini equipment
that is appealing to men, in order to get his permission to use the storefront for some purpose but......

In the latter half, Serena will be necessitated to manage various dangers, having her body in heat...
The salacious store owner forces her into sexual services in the store every day.
Once she leaves the store to go to explore, she will face severe situations and fight with male enemies!

[From DLsite English]