This is NOT a dating sim.... it isn't even a game. This is more of a visual novel than anything. If you're choices had any effect on what happens it could have even been a choose you're own adventure.
1) Interesting storyline
How so? It's basically "boy transfers to school, meets some people, sees classmate strip, the end".
2) Multiple choice when answering a conversation
Yes.... and all pointless. You're choices don't actually make any difference. For instance when the teacher asks you to join the Kendo Club. You can accept or decline but if you decline you're forced to anyway...... so what's the point?
3) Variety of characters
You mean the 6 others in the game besides yourself?
Overall the this isn't bad...... it's just not a game nor is it as good as you try to make it out to be in the description. Change everything to describe what it really is (or change it to actually fit the description) and you're score will probably improve a lot.