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Artist's commentary
A math teacher who doesn't let you concentrate on class
Bonuses
Ci-en ▶ http://ci-en.dlsite.com/creator/5383/article/1888629
FANBOX ▶ http://yuta.fanbox.cc/posts/12272034
Fantia ▶ http://fantia.jp/posts/4152125
Patreon ▶ http://patreon.com/posts/164175928
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