based on episode guides here, and here as well as the official (until 03-14) site (04-11 and onwards).

partially watched.

• ✔ 2015-01-01 new year's sp arashi ryokan
• 2015-01-10 guest: higashiyama noriyuki
• ✔ 2015-01-17 guest: sekai no owari
• ✔ 2015-01-24 guest: kamenashi kazuya (kat-tun)
• 2015-01-31 guest: nagabuchi tsuyoshi
• 2015-02-07 guest: matsuzaka tori & abareru-kun
• 2015-02-14 guest: kumamushi & nikaido fumi
• ✔ 2015-02-21 guest: aragaki yui
• ✔ 2015-02-28 jun & ohno's trip to los angeles and las vegas ★ snp/snp
  • juntoshi: sneaker shopping, hot dogs, antiques
  • jun in vegas: food, roller coaster
  • ohno in vegas: ziplining, mansion viewing, fishing
• 2015-03-07 sakuraiba day off, guest: oikawa mitsuhiro
• 2015-03-14 nino field trip, guest: osawa takao & yoshida kotarou --end format
• 2015-04-11 90 minutes sp
  • segments: jun | aiba | nino | ohno
• 2015-04-18 guest: imai miki
  • segments: sho | ohno
• 2015-04-25 guest: matsushita nao
  • segments: sho | aiba
• 2015-05-02 guest: takahata atsuko
  • segments: nino | jun | aiba
• 2015-05-09 guest: kawata hiromi
  • segments: jun | ohno
• 2015-05-16 guest: yashima norito
  • segments: aiba | nino
• 2015-05-23 guest: hiromi
  • segments: sho | jun
• ✔ 2015-05-30 guest: ikuta toma
  • segments: ohno | nino
• 2015-06-06 guest: suzuki kyoka
  • segments: aiba | sho
• 2015-06-13 guest: katsumura masanobu
  • segments: nino | jun
• 2015-06-20 guest: satou kouichi
  • segments: aiba | ohno
• 2015-07-04 music day sp
  • segments: all
• 2015-07-11 guest: miyazaki aoi
  • segments: sho | ohno
• 2015-07-18 guest: mori hikari
  • segments: nino | jun
• 2015-07-25 guest: miura haruma
  • segments: ohno | sho
• ✔ 2015-08-01 guest: hey! say! jump
  • segments: nino | aiba
• ✔ 2015-08-08 guest: koide keisuke
  • segments: jun | sho
• ✔ 2015-08-15 guest: daigo
  • segments: ohno (with v6's sakamoto masayuki)/aiba (with v6's miyake ken)
• 2015-08-22 24hr tv sp (v6 & hey! say! jump)
  • segments: jun | aiba
• ✔ 2015-08-29 guest: takenaka naoto
  • segments: ohno | jun
• ✔ 2015-09-05 guest: tekken
  • segments: aiba | nino
• ✔ 2015-09-12 guest: sekai no owari
  • segments: sho (with kiritani mirei)
• ✔ 2015-09-19 guest: sato takeru & kamiki ryunosuke
  • segments: sho (with ishihara satomi) | jun
• 2015-10-10 guest: aragaki yui (90 min sp)
  • segments: sho (with yoshida saori)
• 2015-10-17 guest: ito atsushi
  • segments: jun | aiba
• ✔ 2015-10-24 guest: suzuki ryohei ★ snp/snp
  • segment: suzuki ryohei's top 3 recommendations (natto/banana toast, face wrap/kiss, samba)
  • segment: ohno (making smartphone cases)
  • segment: nino (new concert outfits - sea fireflies)
• 2015-10-31 guest: namase katsuhisa
  • segments: nino | aiba
• ✔ 2015-11-07 guest: iseya yuusuke
  • segments: jun (with ikuta toma) | sho
• 2015-11-14 guest: sakana-kun
  • segments: sho | aiba
• ✔ 2015-11-21 guest: hakase taro
  • segments: nino
• 2015-11-28 guest: koyuki
  • segments: sho (with harisenbon)
• 2015-12-05 guest: kondo masahiko
  • segments: jun | aiba
• 2015-12-12 guest: yoshinaga sayuri
  • segments: nino
• 2015-12-19 guest: kato shigeaki (news) & nakajima yuto (hey! say! jump) christmas sp
  • segments: ohno | aiba | jun