Invitation of Tragedy

Invitation of Tragedy is one of seven possible second episodes of Cross Days, the others being: May Light Guide Your Way, Accreditation, Crooked Light, Defeat, Naughty, and Dance of the Sweets.

Plot
On their train to school, Yuuki and Taisuke discuss the upcoming school festival; Yuuki's class will be doing an exhibition on Sakakino's history while Taisuke's class will be doing a maid café. Taisuke then teases Yuuki about his "relationship" with Hikari, which earns him a punch from the latter.

In the meantime, Yuuki has been helping his sister with the basketball team's website, which has kept him up late at night. Upon arriving at Gakuenmae, Youka asks Yuuki to talk to the team's captain about the website, but due to the tensions within the team, Shibukawa won't discuss anything with Yuuki. Additionally, Kotonoha claims to be in a hurry when Yuuki wants to talk to her about Makoto; and Roka, still misunderstanding about Hikari, refuses to speak to him, leaving Yuuki to comment to Taisuke about "tasting life's hardships".

Later at the library, Yuuki sees Makoto walking with Sekai and decides to confront the former. When Yuuki brings up Makoto's alleged relationship with Roka, Makoto (possibly at Roka's direction) makes no attempt to deny this. When Yuuki brings up Sekai, Makoto becomes more flustered, claiming to simply be good friends with Sekai. After Yuuki points out the kissing and embraces witnessed by several people, Makoto switches gears, showing no apparent remorse for his cheating. Sekai returns, and Makoto walks away with her, blowing off Yuuki. Yuuki's frustration with the situation continues even in class. However, he is able to resolve at least part of the basketball team's issue by asking classmate Hatakeyama, who is also on the team, to relay the message.

The next day, preparations begin for the festival. Taisuke tries to recruit Yuuki to help their mutual middle school acquaintance Tanaka with his crush on Setsuna, but Yuuki ultimately refuses, wanting to focus on his own relationship with Roka. Before they leave school, he asks Taisuke to provide insight into Makoto and Sekai, which Taisuke does before elaborating Setsuna, Hikari, and Ai's connections to them. At Gakuenmae, Yuuki attempts to talk to Ai, but fails before she gets on her train. He then sees Makoto and Sekai and decides to follow them. He ends up following the two back to the latter's apartment, where he listens in on them having sex, which also involves Makoto pretending to hate Kotonoha at Sekai's direction.

At lunch the next day, Yuuki goes to the rooftop, witnessing Kotonoha being stood up by Makoto at lunch. That evening, Kotonoha gives Yuuki the lunch she was going to share with Makoto. Infuriated by what Kotonoha has had to suffer, Yuuki decides to kill Sekai.

That evening, at her apartment complex, Sekai spots a stranger armed with a crowbar and wearing a paper bag over their head.