The Anime Lad
Keiki cleans the calligraphy club room and finds a love letter addressed to him. The sender omitted her name but included a pair of underwear, narrowing nothing in a normal way. Several girls were nearby that afternoon. Keiki begins investigating. Romance has become an evidence-handling concern.
Super Eyepatch Fox
Keiki wants a girlfriend and briefly believes an unsigned club-room letter has solved the problem. The enclosed underwear changes the tone. Four girls helped clean that afternoon, giving him a finite suspect list and no sensible way to question anyone without creating a fresh disaster.
Gigguku
Keiki gets the confession he has always wanted, opens the envelope, and finds the wildest possible piece of evidence! Four girls helped clean the room that day. His romantic dream is now a school mystery with terrible interview questions and absolutely no dignified chain of custody.
Father's Basement
Subtlety never enters the club room. The mystery framing at least gives the ecchi premise a direction. Keiki has an unsigned letter, an absurd enclosure, and four possible senders from that afternoon. Solving the case would still leave the more important question of what he should say next.
