This game is a breath of fresh air, which is ironic since it's fairly trope filled. The quality of this game is a testament to the importance of execution. Characters with good designs and likable personalities, who are actually distinct from one another. An MC who is simultaneously smart, willful, and not a scumbag (this is a big plus due to the sheer volume of MCs who are either wimpy, dumb, and/or creepy). That MC has a good relationship with his mom and both of his sisters, is also worth mentioning. While I don't mind a bit of tsundere, the "one sister loves you and one hates you" trope is among my least favorite. As is boyfriend (or ex-bf) drama, especially when it comes to sisters, which thankfully is not even slightly present. While I do greatly appreciate the efforts of ESL devs, it is always nice to see a game which is written by a native, or at least fluent, English speaker. I also always love to see outlined text with no textbox, hallelujah! The only real criticism I can think of is that the bloom and/or gamma is a little too intense in some scenes (like the MC sitting on the couch with his mom). I can't wait to see more of this extremely promising game.
And as others have pointed out Aki is particularly adorable, as are Aria and Sienna.