Knockout Kick

Plots
Knockout Kick is a bad ending in Shiny Days.

Knockout Kick is identical to Like Mother, Like Daughter up to the point when Mai asks about whether Makoto being Sekai's boyfriend or not on the train.

When being asked about whether he is Sekai's boyfriend, Makoto, hoping not to cause further troubles, says "yes" and drags Sekai off the train. He then asks Sekai to explain to Mai personally about the situation that he is not really Sekai's boyfriend, Sekai hesitates and invites him to her home.

At Sekai's home, Sekai asks Makoto about how he feels on Setsuna, Makoto says he hurt Setsuna too much and he shall give up. Then Sekai asks what Makoto thinks Setsuna may comment on him. Makoto replies that Setsuna may blame him for not being good at having sex, and people always blacken their ex-boyfriends/girlfriends. However, Sekai replies that Setsuna feels quite good at having sex with Makoto. Then Makoto encourages Sekai to have a try. saying he has given up on Setsuna so now his real love is Sekai. Then Makoto and Sekai proceed to have sex.

Back at Sakakino Hotel, Shun and Mai are discussing. Mai says that Youko is busy finding her boyfriend, which makes Shun unhappy. Then Mai says Sekai is also with her handsome boyfriend that she saw them together on the train. Overhearing this, Setsuna soon realizes what happens and leaves.

Setsuna hurries to Sekai's room, only to find Makoto and Sekai having sex. Makoto asks Setsuna to join them. Setsuna, extremely furious and disappointed on what happens, replies with a Knockout Kick.

Route
To get Knockout Kick, the following criteria shall be met.
 * Makoto shall seduce Youko before he starts dating with Setsuna, otherwise you'll get Setsuna Disappears instead.
 * By the time Setsuna leaves for Paris, the bar shall be low enough, otherwise you'll get Together instead.
 * Makoto must answer "yes" when questioned by Mai about whether he is Sekai's boyfriend or not, otherwise you'll get either Like Mother, Like Daughter or Succumbing to Pleasure instead.
 * If Makoto pretends Sekai being his girlfriend during his beach conversation with Setsuna in Episode 2, he'll not be able to answer "yes" to Mai's question and the question is just skipped.
 * Makoto must answer "She thinks I'm not good at sex." when being questioned by Sekai about what Setsuna may comment on him. Otherwise the ending will be either With My Family or Interception.

Trivia

 * In the original release, the title is 必殺キック, which means Deadly kick.